Increase available RAM for RTX on LPC11U24
Increase available RAM for RTX on LPC11U24

The INITIAL_SP value used by RTX was originally at the 4k limit instead
of at the 8k limit.  The HEAP_START macro was defined to __HeapLimit
but the heap really starts at __end__.  __HeapLimit is just used for
some link time sanity checks to verify that the heap and stack can
grow a bit without colliding.

andcor02/mbed-os,betzw/mbed-os,brstew/MBED-BUILD,adustm/mbed,mikaleppanen/mbed-os,netzimme/mbed-os,jamesadevine/mbed,HeadsUpDisplayInc/mbed,xcrespo/mbed,HeadsUpDisplayInc/mbed,iriark01/mbed-drivers,ban4jp/mbed,hwfwgrp/mbed,kpurusho/mbed,rgrover/mbed,kl-cruz/mbed-os,catiedev/mbed-os,andcor02/mbed-os,jferreir/mbed,Tiryoh/mbed,kjbracey-arm/mbed,CalSol/mbed,logost/mbed,nabilbendafi/mbed,netzimme/mbed-os,FranklyDev/mbed,masaohamanaka/mbed,Willem23/mbed,ryankurte/mbed-os,ban4jp/mbed,adustm/mbed,Tiryoh/mbed,monkiineko/mbed-os,logost/mbed,getopenmono/mbed,struempelix/mbed,HeadsUpDisplayInc/mbed,maximmbed/mbed,ARM-software/mbed-beetle,rosterloh/mbed,EmuxEvans/mbed,hwfwgrp/mbed,0xc0170/mbed-drivers,GustavWi/mbed,wodji/mbed,adustm/mbed,jferreir/mbed,devanlai/mbed,CalSol/mbed,screamerbg/mbed,betzw/mbed-os,devanlai/mbed,hwfwgrp/mbed,Archcady/mbed-os,masaohamanaka/mbed,Tiryoh/mbed,pi19404/mbed,larks/mbed,kl-cruz/mbed-os,YarivCol/mbed-os,arostm/mbed-os,andcor02/mbed-os,radhika-raghavendran/mbed-os5.1-onsemi,autopulated/mbed,YarivCol/mbed-os,bcostm/mbed-os,Timmmm/mbed,nabilbendafi/mbed,Marcomissyou/mbed,getopenmono/mbed,nRFMesh/mbed-os,DanKupiniak/mbed,Marcomissyou/mbed,jrjang/mbed,al177/mbed,theotherjimmy/mbed,NXPmicro/mbed,mmorenobarm/mbed-os,devanlai/mbed,Timmmm/mbed,adamgreen/mbed,nRFMesh/mbed-os,K4zuki/mbed,FranklyDev/mbed,ban4jp/mbed,masaohamanaka/mbed,theotherjimmy/mbed,larks/mbed,pi19404/mbed,al177/mbed,CalSol/mbed,bcostm/mbed-os,Shengliang/mbed,EmuxEvans/mbed,Marcomissyou/mbed,jeremybrodt/mbed,pedromes/mbed,Timmmm/mbed,CalSol/mbed,NordicSemiconductor/mbed,adustm/mbed,brstew/MBED-BUILD,NXPmicro/mbed,pradeep-gr/mbed-os5-onsemi,sam-geek/mbed,naves-thiago/mbed-midi,naves-thiago/mbed-midi,larks/mbed,radhika-raghavendran/mbed-os5.1-onsemi,maximmbed/mbed,xcrespo/mbed,nabilbendafi/mbed,al177/mbed,cvtsi2sd/mbed-os,nabilbendafi/mbed,pbrook/mbed,geky/mbed,wodji/mbed,pbrook/mbed,brstew/MBED-BUILD,fanghuaqi/mbed,andreaslarssonublox/mbed,betzw/mbed-os,cvtsi2sd/mbed-os,netzimme/mbed-os,rgrover/mbed,andreaslarssonublox/mbed,struempelix/mbed,nRFMesh/mbed-os,kjbracey-arm/mbed,RonEld/mbed,wodji/mbed,YarivCol/mbed-os,NitinBhaskar/mbed,alertby/mbed,maximmbed/mbed,JasonHow44/mbed,alertby/mbed,infinnovation/mbed-os,bcostm/mbed-os,Marcomissyou/mbed,c1728p9/mbed-os,ryankurte/mbed-os,nvlsianpu/mbed,DanKupiniak/mbed,bulislaw/mbed-os,kl-cruz/mbed-os,pradeep-gr/mbed-os5-onsemi,geky/mbed,mnlipp/mbed,Shengliang/mbed,tung7970/mbed-os,RonEld/mbed,FranklyDev/mbed,ban4jp/mbed,jamesadevine/mbed,radhika-raghavendran/mbed-os5.1-onsemi,mnlipp/mbed,pedromes/mbed,monkiineko/mbed-os,logost/mbed,fpiot/mbed-ats,arostm/mbed-os,fpiot/mbed-ats,theotherjimmy/mbed,rosterloh/mbed,fvincenzo/mbed-os,mikaleppanen/mbed-os,pbrook/mbed,brstew/MBED-BUILD,j-greffe/mbed-os,FranklyDev/mbed,nabilbendafi/mbed,svastm/mbed,j-greffe/mbed-os,betzw/mbed-os,fanghuaqi/mbed,monkiineko/mbed-os,svogl/mbed-os,ryankurte/mbed-os,fahhem/mbed-os,Archcady/mbed-os,mazimkhan/mbed-os,NitinBhaskar/mbed,struempelix/mbed,karsev/mbed-os,netzimme/mbed-os,bulislaw/mbed-os,alertby/mbed,masaohamanaka/mbed,cvtsi2sd/mbed-os,naves-thiago/mbed-midi,GustavWi/mbed,mikaleppanen/mbed-os,mazimkhan/mbed-os,jamesadevine/mbed,xcrespo/mbed,mbedmicro/mbed,EmuxEvans/mbed,ryankurte/mbed-os,andcor02/mbed-os,masaohamanaka/mbed,betzw/mbed-os,larks/mbed,fahhem/mbed-os,karsev/mbed-os,kl-cruz/mbed-os,logost/mbed,svastm/mbed,fvincenzo/mbed-os,screamerbg/mbed,JasonHow44/mbed,Sweet-Peas/mbed,pradeep-gr/mbed-os5-onsemi,nvlsianpu/mbed,devanlai/mbed,Marcomissyou/mbed,pi19404/mbed,NordicSemiconductor/mbed,getopenmono/mbed,arostm/mbed-os,JasonHow44/mbed,kpurusho/mbed,pradeep-gr/mbed-os5-onsemi,kl-cruz/mbed-os,mnlipp/mbed,bentwire/mbed,0xc0170/mbed-drivers,theotherjimmy/mbed,j-greffe/mbed-os,monkiineko/mbed-os,catiedev/mbed-os,mnlipp/mbed,autopulated/mbed,svogl/mbed-os,bentwire/mbed,adamgreen/mbed,infinnovation/mbed-os,mikaleppanen/mbed-os,pbrook/mbed,Willem23/mbed,CalSol/mbed,j-greffe/mbed-os,fpiot/mbed-ats,al177/mbed,RonEld/mbed,Marcomissyou/mbed,jpbrucker/mbed,YarivCol/mbed-os,NitinBhaskar/mbed,NitinBhaskar/mbed,xcrespo/mbed,bentwire/mbed,Sweet-Peas/mbed,naves-thiago/mbed-midi,HeadsUpDisplayInc/mbed,adamgreen/mbed,kpurusho/mbed,RonEld/mbed,fpiot/mbed-ats,mnlipp/mbed,Sweet-Peas/mbed,GustavWi/mbed,screamerbg/mbed,ban4jp/mbed,jamesadevine/mbed,jrjang/mbed,pi19404/mbed,nabilbendafi/mbed,cvtsi2sd/mbed-os,pradeep-gr/mbed-os5-onsemi,karsev/mbed-os,andcor02/mbed-os,tung7970/mbed-os-1,geky/mbed,nvlsianpu/mbed,karsev/mbed-os,brstew/MBED-BUILD,YarivCol/mbed-os,NXPmicro/mbed,radhika-raghavendran/mbed-os5.1-onsemi,Tiryoh/mbed,ARM-software/mbed-beetle,adustm/mbed,geky/mbed,fpiot/mbed-ats,mmorenobarm/mbed-os,fahhem/mbed-os,j-greffe/mbed-os,jamesadevine/mbed,catiedev/mbed-os,JasonHow44/mbed,cvtsi2sd/mbed-os,Tiryoh/mbed,maximmbed/mbed,mazimkhan/mbed-os,infinnovation/mbed-os,arostm/mbed-os,devanlai/mbed,monkiineko/mbed-os,jpbrucker/mbed,kpurusho/mbed,Timmmm/mbed,pedromes/mbed,mmorenobarm/mbed-os,fahhem/mbed-os,bulislaw/mbed-os,rgrover/mbed,NordicSemiconductor/mbed,rosterloh/mbed,jrjang/mbed,bcostm/mbed-os,netzimme/mbed-os,Willem23/mbed,larks/mbed,Willem23/mbed,tung7970/mbed-os,devanlai/mbed,logost/mbed,al177/mbed,mazimkhan/mbed-os,Archcady/mbed-os,Sweet-Peas/mbed,GustavWi/mbed,bikeNomad/mbed,dbestm/mbed,jrjang/mbed,catiedev/mbed-os,arostm/mbed-os,RonEld/mbed,wodji/mbed,kl-cruz/mbed-os,bulislaw/mbed-os,kjbracey-arm/mbed,autopulated/mbed,YarivCol/mbed-os,logost/mbed,Shengliang/mbed,bulislaw/mbed-os,al177/mbed,pedromes/mbed,fanghuaqi/mbed,catiedev/mbed-os,wodji/mbed,pi19404/mbed,sg-/mbed-drivers,tung7970/mbed-os,sam-geek/mbed,adamgreen/mbed,karsev/mbed-os,mnlipp/mbed,fvincenzo/mbed-os,RonEld/mbed,Timmmm/mbed,mmorenobarm/mbed-os,mbedmicro/mbed,K4zuki/mbed,pedromes/mbed,jeremybrodt/mbed,alertby/mbed,jpbrucker/mbed,sam-geek/mbed,mikaleppanen/mbed-os,arostm/mbed-os,andreaslarssonublox/mbed,pi19404/mbed,karsev/mbed-os,jferreir/mbed,sg-/mbed-drivers,ryankurte/mbed-os,screamerbg/mbed,radhika-raghavendran/mbed-os5.1-onsemi,mbedmicro/mbed,sam-geek/mbed,cvtsi2sd/mbed-os,bikeNomad/mbed,rgrover/mbed,getopenmono/mbed,alertby/mbed,Shengliang/mbed,Tiryoh/mbed,Archcady/mbed-os,mbedmicro/mbed,autopulated/mbed,mikaleppanen/mbed-os,Shengliang/mbed,xcrespo/mbed,Archcady/mbed-os,bcostm/mbed-os,autopulated/mbed,mbedmicro/mbed,wodji/mbed,jferreir/mbed,K4zuki/mbed,Sweet-Peas/mbed,nvlsianpu/mbed,infinnovation/mbed-os,K4zuki/mbed,DanKupiniak/mbed,hwfwgrp/mbed,c1728p9/mbed-os,nRFMesh/mbed-os,bikeNomad/mbed,struempelix/mbed,K4zuki/mbed,brstew/MBED-BUILD,bremoran/mbed-drivers,theotherjimmy/mbed,svogl/mbed-os,alertby/mbed,nRFMesh/mbed-os,NXPmicro/mbed,getopenmono/mbed,mazimkhan/mbed-os,jeremybrodt/mbed,fvincenzo/mbed-os,svogl/mbed-os,bentwire/mbed,adamgreen/mbed,bikeNomad/mbed,bremoran/mbed-drivers,rosterloh/mbed,sam-geek/mbed,dbestm/mbed,bikeNomad/mbed,jferreir/mbed,maximmbed/mbed,svastm/mbed,tung7970/mbed-os,fanghuaqi/mbed,radhika-raghavendran/mbed-os5.1-onsemi,tung7970/mbed-os-1,JasonHow44/mbed,catiedev/mbed-os,struempelix/mbed,dbestm/mbed,pedromes/mbed,adustm/mbed,geky/mbed,jrjang/mbed,JasonHow44/mbed,dbestm/mbed,EmuxEvans/mbed,rosterloh/mbed,rgrover/mbed,netzimme/mbed-os,ARM-software/mbed-beetle,dbestm/mbed,jeremybrodt/mbed,HeadsUpDisplayInc/mbed,NXPmicro/mbed,fanghuaqi/mbed,ARM-software/mbed-beetle,nvlsianpu/mbed,theotherjimmy/mbed,pbrook/mbed,c1728p9/mbed-os,monkiineko/mbed-os,EmuxEvans/mbed,andcor02/mbed-os,adamgreen/mbed,masaohamanaka/mbed,fvincenzo/mbed-os,jpbrucker/mbed,screamerbg/mbed,struempelix/mbed,maximmbed/mbed,EmuxEvans/mbed,andreaslarssonublox/mbed,andreaslarssonublox/mbed,jpbrucker/mbed,iriark01/mbed-drivers,bentwire/mbed,screamerbg/mbed,NitinBhaskar/mbed,autopulated/mbed,rosterloh/mbed,kjbracey-arm/mbed,FranklyDev/mbed,jpbrucker/mbed,naves-thiago/mbed-midi,svastm/mbed,K4zuki/mbed,ryankurte/mbed-os,dbestm/mbed,fahhem/mbed-os,tung7970/mbed-os-1,DanKupiniak/mbed,xcrespo/mbed,kpurusho/mbed,jeremybrodt/mbed,c1728p9/mbed-os,HeadsUpDisplayInc/mbed,tung7970/mbed-os,j-greffe/mbed-os,GustavWi/mbed,NordicSemiconductor/mbed,nvlsianpu/mbed,ban4jp/mbed,larks/mbed,Willem23/mbed,hwfwgrp/mbed,bentwire/mbed,Shengliang/mbed,jrjang/mbed,svogl/mbed-os,mmorenobarm/mbed-os,jferreir/mbed,c1728p9/mbed-os,fahhem/mbed-os,tung7970/mbed-os-1,Timmmm/mbed,Archcady/mbed-os,infinnovation/mbed-os,pradeep-gr/mbed-os5-onsemi,infinnovation/mbed-os,getopenmono/mbed,pbrook/mbed,bcostm/mbed-os,Sweet-Peas/mbed,tung7970/mbed-os-1,betzw/mbed-os,hwfwgrp/mbed,mmorenobarm/mbed-os,kpurusho/mbed,mazimkhan/mbed-os,NXPmicro/mbed,bulislaw/mbed-os,svogl/mbed-os,fpiot/mbed-ats,CalSol/mbed,c1728p9/mbed-os,jamesadevine/mbed,svastm/mbed,nRFMesh/mbed-os,naves-thiago/mbed-midi