Change Variable driver (Pei/RuntimeDxe) to support the default variable data stored in HOB.

Signed-off-by: niruiyu
Reviewed-by: erictian

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12538 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Variable/Pei/Variable.h

@@ -30,6 +30,13 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #include <Guid/VariableFormat.h>
 #include <Guid/VariableIndexTable.h>
+
+typedef enum {
+  VariableStoreTypeHob,
+  VariableStoreTypeNv,
+  VariableStoreTypeMax
+} VARIABLE_STORE_TYPE;
+
 //
 // Functions
 //