[arch][arm] fix a bug in ARM that sized the heap incorrectly
[arch][arm] fix a bug in ARM that sized the heap incorrectly

ianloic/lk,hollanderic/lkstuff,GCrean/lk,littlekernel/lk,ErikCorryGoogle/lk,nvll/lk,pablomarx/lk,sndnvaps/lk,skabet/lk,minglun-tsai/lk,nvll/lk,ianloic/lk,srodrig1/lk,GCrean/lk,pablomarx/lk,srodrig1/lk,srodrig1/lk,grub4android/lk,travisg/lk,pablomarx/lk,skabet/lk,skabet/lk,littlekernel/lk,ianloic/lk,minglun-tsai/lk,minglun-tsai/lk,nvll/lk,pablomarx/lk,grub4android/lk,GCrean/lk,travisg/lk,sndnvaps/lk,GCrean/lk,sndnvaps/lk,srodrig1/lk,M1cha/lk,pablomarx/lk,hollanderic/lkstuff,grub4android/lk,sndnvaps/lk,M1cha/lk,nvll/lk,littlekernel/lk,grub4android/lk,GCrean/lk,sndnvaps/lk,skabet/lk,hollanderic/lkstuff,ErikCorryGoogle/lk,ErikCorryGoogle/lk,nvll/lk,hollanderic/lkstuff,srodrig1/lk,littlekernel/lk,minglun-tsai/lk,grub4android/lk,ErikCorryGoogle/lk,ianloic/lk,M1cha/lk,skabet/lk,M1cha/lk,travisg/lk,M1cha/lk,travisg/lk