mb/asus/p5gc-mx: Implement resume from S3 support
Needs the ramstage configuration enabling of SuperIO GPIO pnp devices
for BSEL straps.
Also needs VSBGATE# to be on for ram to be powered during S3.
TESTED with 800MHz and 1067MHz FSB CPUs at the correct straps when
resuming from S3.
Change-Id: I6ac927ee9dcce15fc7621aad57969fae8f5805ca
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19602
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>