OvmfPkg/PlatformPei: Add InitializeRamRegions function

In the next commit we will update the Xen boot path
to also use this function.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15206 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/PlatformPei/Platform.c

@@ -355,7 +355,7 @@ InitializePlatform (
   PublishPeiMemory ();
 
   if (!mXen) {
-    MemDetect ();
+    InitializeRamRegions ();
   }
 
   if (mXen) {