Fix missing VM mapping

Fix missing VM mapping

When processing FORWARD records, we weren't accounting for the pointer
being in the physical address space and not the virtual space instead.

Change-Id: I35ef637fbec7886d4cfeac5fd650a17eae8d555a
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Reviewed-on: http://review.coreboot.org/499
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>