OvmfPkg EmuVariableFvb: Use 64-bit NV storage PCD

Change from using PcdFlashNvStorageVariableBase to
PcdFlashNvStorageVariableBase64.

This will make sure the EMU Variable FVB will
function in systems with more than 4GB of memory.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11252 6f19259b-4bc3-4df7-8a09-765794883524
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 05d9987..d2b9652 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -240,7 +240,7 @@
 

 [PcdsDynamicDefault]

   gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvStoreReserved|0

-  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase|0

+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64|0

   gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase|0

   gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase|0