common: board_f: change calculation of gd->mon_len to fix s5p4418 reloc

ARCH_NEXELL: Change calculation of monitor length (gd->mon_len) to fix
relocation at boards with s5p4418-SoC (ARCH_NEXELL). At s5p4418, _start
is after the header (NSIH). Therefore the monitor length has to be
calculated using __image_copy_start instead of _start in order the
whole monitor code is relocated.

Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
1 file changed