Don't run VGA option ROMs on S3 resume.

This will save us a few 100 ms on resume.

Change-Id: Iabf4c8ab88662ba41236162f0a6f5bd80d8c1255
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/715
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>