Adds DDIMM EFD decoder API

Change-Id: Ib8ee970a27fa8847c86caea47bb49552ce244483
Original-Change-Id: I6e06b867f93c0c813be1c5f05c486569c8650f6e
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/70509
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Mark Pizzutillo <mark.pizzutillo@ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

src/import/generic/memory/lib/utils/shared/mss_generic_consts.H

@@ -206,7 +206,7 @@ enum rev : uint8_t
     GEN_SEC_MAX = V1_1,
     RDIMM_MAX = V1_1,
     LRDIMM_MAX = V1_2,
-    DDIMM_MAX = V1_0,
+    DDIMM_MAX = V0_0,
 };
 
 ///
@@ -255,6 +255,21 @@ enum guard_band : uint16_t
 
 }// spd
 
+namespace efd
+{
+
+
+///
+/// @brief EFD Module identifier
+/// @note helps distinguish the EFD identifier
+///
+enum id
+{
+    DDR4_CUSTOM_MICROCHIP = 0x11,
+};
+
+}//efd
+
 ///
 /// @brief DIMM nibble mask
 /// @note nibble0: 4 high bits, nibble1: 4 low bits