drivers/intel/fsp2_0: Remove BUILD_TIME_STAMP_SIZE macro

Remove BUILD_TIME_STAMP_SIZE macro from coreboot because FSP 3223
version have BUILD_TIME_STAMP_SIZE macro defined as part of
`FspProducerDataHeader.h`.

Ref change:
9c28ab1d1a vc/intel/fsp/mtl: Update header files from 3194_81 to 3223.80

BUG=b:285110116
TEST=Able to build google/rex.

Change-Id: I52707adf1aa6dadca8dcf82102f76916a0cfe346
Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76341
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
diff --git a/src/drivers/intel/fsp2_0/include/fsp/soc_binding.h b/src/drivers/intel/fsp2_0/include/fsp/soc_binding.h
index 952bc4c..ba3e289 100644
--- a/src/drivers/intel/fsp2_0/include/fsp/soc_binding.h
+++ b/src/drivers/intel/fsp2_0/include/fsp/soc_binding.h
@@ -28,7 +28,6 @@
 #include <FspmUpd.h>
 #include <FspsUpd.h>
 #if CONFIG(MRC_CACHE_USING_MRC_VERSION)
-#define BUILD_TIME_STAMP_SIZE 12
 #include <FspProducerDataHeader.h>
 #endif
 #if CONFIG(DISPLAY_FSP_VERSION_INFO)