mb/google/zork: fix SMMSTORE size, alignment in default FMAP

SMMSTORE needs to have 64k size (minimum) and have 64k alignment as
enforced by asserts added in commit 1ba6049
[drivers/smmstore/store.c: Add static assertion based on fmap].
Adjust size and alignment of SMMSTORE region in FMAP to ensure those conditions are met.

Test: build google/morphius without asserts being tripped for above conditions.

Change-Id: Ied04e93379e1507f5e6b2a1b71e4098a4561e5d8
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62443
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/zork/chromeos.fmd

@@ -18,7 +18,8 @@ FLASH@0xFF000000 16M {
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 4K
+		PAD_TO_ALIGN_STORE 16K
+		SMMSTORE(PRESERVE) 64K
 		RW_LEGACY(CBFS)
 		WP_RO@8M 8M {
 			RO_VPD(PRESERVE) 16K