powerpc: mpc85xx: use CONFIG_VAL() for SYS_MONITOR_BASE in start.s

Use CONFIG_VAL() for SYS_MONITOR_BASE in start.S so that correct value
is used for SPL.

Signed-off-by: Marek Mojík <marek.mojik@nic.cz>
Reviewed-by: Marek Behún <kabel@kernel.org>
1 file changed