Add a weak variant routine to allow variants to perform any needed
initialization in ramstage.
BUG=b:178094376
TEST=none
Change-Id: I65dc1cdf15b68d9f2239e02fcb4b2c902d749378
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50827
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>