{commonlib/drivers}: Have option to store MRC version inside CBMEM

This patch introduces CBMEM ID to store the MRC version (similar to
existing implementation that stores the FSP-M version inside CBMEM ID)
inside cbmem so the version information is available across the
different coreboot stages. For example:

* romstage: Use the CBMEM ID version information to check if the MRC
            cache is valid and need to erase the MRC cache
* ramstage: Use the CBMEM ID to store the MRC cache into the
            non-volatile space.

BUG=b:261689642
TEST=Able to build and boot google/rex and dump the MRC version as
below.

  cbmem --list
  CBMEM table of contents:
      NAME                  ID        START     LENGTH
      ...
      21. MRC VERSION       5f43524d  75ffeb60  00000004
      ...

  localhost ~ # cbmem -r 5f43524d | hexdump
  00000000  01 12 07 00

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I91f735239b33c6f8ba41c076048903e4b213c6a2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75921
Reviewed-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/commonlib/bsd/include/commonlib/bsd/cbmem_id.h

@@ -27,6 +27,7 @@
 #define CBMEM_ID_FSP_RESERVED_MEMORY 0x46535052
 #define CBMEM_ID_FSP_RUNTIME	0x52505346
 #define CBMEM_ID_FSPM_VERSION	0x56505346
+#define CBMEM_ID_MRC_VERSION	0x5f43524d
 #define CBMEM_ID_GDT		0x4c474454
 #define CBMEM_ID_HOB_POINTER	0x484f4221
 #define CBMEM_ID_IGD_OPREGION	0x4f444749
@@ -112,6 +113,7 @@
 	{ CBMEM_ID_FSP_RESERVED_MEMORY, "FSP MEMORY " }, \
 	{ CBMEM_ID_FSP_RUNTIME,		"FSP RUNTIME" }, \
 	{ CBMEM_ID_FSPM_VERSION,	"FSPM VERSION" }, \
+	{ CBMEM_ID_MRC_VERSION,		"MRC VERSION" }, \
 	{ CBMEM_ID_GDT,			"GDT        " }, \
 	{ CBMEM_ID_HOB_POINTER,		"HOB        " }, \
 	{ CBMEM_ID_IGD_OPREGION,	"IGD OPREGION" }, \