[arch][arm] add support for cortex-m3, tweak some output
[arch][arm] add support for cortex-m3, tweak some output

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