MdePkg: MmConfiguration: Added definition of MM Configuration PPI

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3440

MM Configuration PPI was defined in PI Specification since v1.5. This
change added definition of such PPI and related GUIDs into MdePkg.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>

Signed-off-by: Kun Qin <kuqin12@gmail.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>

MdePkg/MdePkg.dec

@@ -983,6 +983,9 @@
   ## Include/Ppi/MmControl.h
   gEfiPeiMmControlPpiGuid         =  { 0x61c68702, 0x4d7e, 0x4f43, { 0x8d, 0xef, 0xa7, 0x43, 0x5, 0xce, 0x74, 0xc5 }}
 
+  ## Include/Ppi/MmConfiguration.h
+  gEfiPeiMmConfigurationPpi       =  { 0xc109319, 0xc149, 0x450e, { 0xa3, 0xe3, 0xb9, 0xba, 0xdd, 0x9d, 0xc3, 0xa4 } }
+
   #
   # PPIs defined in PI 1.7.
   #