nb/intel/sandybridge/raminit: prepare raminit for fallback

Return errors to top level ram init function.
Required by the folowing series to implement a fallback.

No functionality is changed.
On error case the system still halts in every test.

Change-Id: I6278c4a1d7b4a96be8988a60671fc3d72cd6cb3d
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/14170
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed