mb/google/nissa: add RO_GSCVD section to WP_RO

This area is used for storing AP RO verification information.

BRANCH=none
BUG=b:227801913
TEST=build and boot nivviks

Signed-off-by: Kangheui Won <khwon@chromium.org>
Change-Id: If5c03aca56e659d61c31613b284a55d0eba0d843
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64067
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Reka Norman <rekanorman@chromium.org>

src/mainboard/google/brya/chromeos-nissa.fmd

@@ -47,6 +47,7 @@ FLASH 32M {
 		# memory protected range specification.
 		WP_RO 4M {
 			RO_VPD(PRESERVE) 16K
+			RO_GSCVD 8K
 			RO_SECTION {
 				FMAP 2K
 				RO_FRID 64