mb/google/zork: add UPDM updating function before runing FSP-M

Add the UPD updating hook in early stage for customization.

BUG=b:117719313
BRANCH=zork
TEST=build,check the hook function been executed.

Signed-off-by: Chris Wang <chris.wang@amd.corp-partner.google.com>
Change-Id: I4954a438a51b29b086015624127e651fd06f971b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51181
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/zork/Makefile.inc

@@ -4,6 +4,7 @@ bootblock-y += bootblock.c
 
 romstage-y += chromeos.c
 romstage-y += sku_id.c
+romstage-y += romstage.c
 
 ramstage-y += chromeos.c
 ramstage-y += ec.c

src/mainboard/google/zork/romstage.c

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+#include <soc/romstage.h>
+
+void __weak variant_updm_update(FSP_M_CONFIG *mcfg) {}
+
+void mainboard_updm_update(FSP_M_CONFIG *mcfg)
+{
+	variant_updm_update(mcfg);
+}

src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h

@@ -6,6 +6,7 @@
 #include <stddef.h>
 #include <boardid.h>
 #include <ec/google/chromeec/ec.h>
+#include <FspmUpd.h>
 #include <soc/platform_descriptors.h>
 #include "chip.h"
 
@@ -32,6 +33,8 @@ const struct soc_amd_gpio *variant_bootblock_gpio_table(size_t *size, int slp_ty
  */
 const struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size, int slp_typ);
 
+void variant_updm_update(FSP_M_CONFIG *mcfg);
+
 /* Program any required GPIOs at the finalize phase */
 void finalize_gpios(int slp_typ);
 /* Modify devictree settings during ramstage. */