arch: arm: fix ci failure

This is to fix ci failure caused by commit d5d4d579

In the above commit, it's wrongly assumed that ROM_ADDR and RAM_ADDR
are same **only** when CONFIG_XIP is not defined.
Since aarch64 was taken as reference in the review,
we missed to see that CONFIG_FLASH_SIZE is also part of the condition
to define ROM_ADDR as RAM_ADDR.
CONFIG_XIP is not defined for qemu_cortex_a9/xc7z007s however,
CONFIG_FLASH_SIZE is not 0 so the assumption fails
and the required reset to RAM_ADDR is not applied leading to the test
failure.

Signed-off-by: Sudan Landge <sudan.landge@arm.com>