arm: print information about loaded UEFI images

arm: print information about loaded UEFI images

If an exception occurs in a UEFI loaded image we need the start address of
the image to determine the relocation offset.

This patch adds the necessary lines after the registers in the crash dump
for armv8. A possible output would be:

UEFI image [0x00000000bffe6000:0x00000000bffe631f] pc=0x138 '/\snp.efi'

With the offset 0x138 we can now find the relevant instruction in the
disassembled 'snp.efi' binary.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>