Move HRM and DELTA targets to use LFCLK define
Move HRM and DELTA targets to use LFCLK define

After this change it will no longer be necessary to list all
the platforms that require the LFCKL to be the internal RC oscillator,
instead we specify it as a property of the platform.

Applications and libraries can use the TARGET_NRF_LFCLK_RC symbol to
filter for platforms that don't have an external crystal.

Signed-off-by: Jonathan Austin <977805957f645e95b2e79f6a41933c0de1ff99a1@arm.com>

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