vc/intel/edk2/edk2-stable202111: Safe guard enum macro in SmBios.h

Fix compilation issue due to enum macro redefinition by safeguarding
definitions with DISPLAY_FSP_VERSION_INFO_2 in SoC Kconfig.

Back-ported from commit f7e8adac7b ("edk2-stable202005: Update
MdePkg/Include/IndustryStandard/SmBios.h") to fix compilation issue due
to enum macro redefinition.

BUG=b:260183604
TEST=Verify MTL Rex0 build with the patch
and verify the version output prints no junk data.

Signed-off-by: Saurabh Mishra <mishra.saurabh@intel.corp-partner.google.com>
Change-Id: Ibc65d05a8b4bd232b91184ff8cd52a20cd3538ae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69961
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Ronak Kanabar <ronak.kanabar@intel.com>

src/vendorcode/intel/edk2/edk2-stable202111/MdePkg/Include/IndustryStandard/SmBios.h

@@ -1263,6 +1263,7 @@ typedef struct {
   UINT8                     PortType;                       ///< The enumeration value from MISC_PORT_TYPE.
 } SMBIOS_TABLE_TYPE8;
 
+#if !CONFIG(DISPLAY_FSP_VERSION_INFO_2)
 ///
 /// System Slots - Slot Type
 ///
@@ -1375,6 +1376,7 @@ typedef enum {
   SlotLengthLong    = 0x04
 } MISC_SLOT_LENGTH;
 
+#endif
 ///
 /// System Slots - Slot Characteristics 1.
 ///