dev-arm: Don't unconditionally overwrite bootloader params

The bootloader arguments were previously defaulting to a predetermined
value even if initialized elsewhere in the platform config script.
This commit fixes this issue by not calling the default initialization
routine if the bootloader is already defined.

Change-Id: Id80af4762b52dc036da29430b2795bb30970a349
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/3967
1 file changed