OvmfPkg/PlatformPei: Relocate SmBases in PEI phase

This patch is to consume SmmRelocationInit for SmBase
Relocation.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>

OvmfPkg/PlatformPei/Platform.h

@@ -78,6 +78,11 @@ InstallClearCacheCallback (
   VOID
   );
 
+VOID
+RelocateSmBase (
+  VOID
+  );
+
 VOID
 AmdSevInitialize (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob