CFR: Add version field to root struct

Add a version field to the CFR root struct so parsers can check
compatibility when parsing structs.

Change-Id: Ifcb950f1bdedc0ab925f3841befb7e7001c0f7f4
Signed-off-by: Filip Brozovic <fbrozovic@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86080
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/commonlib/include/commonlib/cfr.h

@@ -49,6 +49,8 @@
  *
  */
 
+#define CFR_VERSION 0x00000000
+
 enum cfr_tags {
 	CFR_TAG_OPTION_FORM		= 1,
 	CFR_TAG_ENUM_VALUE		= 2,

src/commonlib/include/commonlib/coreboot_tables.h

@@ -602,6 +602,7 @@ struct lb_efi_fw_info {
 struct lb_cfr {
 	uint32_t tag;
 	uint32_t size;
+	uint32_t version;
 	uint32_t checksum;	/* Checksum of the variable payload. */
 	/* struct lb_cfr_option_form		forms[] */
 };

src/drivers/option/cfr.c

@@ -307,6 +307,7 @@ void cfr_write_setup_menu(struct lb_cfr *cfr_root, struct sm_obj_form *sm_root[]
 
 	cfr_root->tag = LB_TAG_CFR_ROOT;
 	cfr_root->size = sizeof(*cfr_root);
+	cfr_root->version = CFR_VERSION;
 
 	current += cfr_root->size;
 	while (sm_root && sm_root[i])