post_code: add post code for invalid vendor binary

Add a new post code POST_INVALID_VENDOR_BINARY, used when coreboot fails
to locate or validate a vendor supplied binary.

BUG=b:124401932
BRANCH=sarien
TEST=build coreboot for sarien and arcada platforms

Change-Id: Ib1e359d4e8772c37922b1b779135e58c73bff6b4
Signed-off-by: Keith Short <keithshort@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32772
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/northbridge/intel/haswell/raminit.c

@@ -166,7 +166,8 @@ void sdram_initialize(struct pei_data *pei_data)
 			default:
 				printk(BIOS_ERR, "MRC returned %x.\n", rv);
 			}
-			die("Nonzero MRC return value.\n");
+			die_with_post_code(POST_INVALID_VENDOR_BINARY,
+					   "Nonzero MRC return value.\n");
 		}
 	} else {
 		die("UEFI PEI System Agent not found.\n");