OvmfPkg/PlatformInitLib: Create MemDetect.c

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3863

Move functions in PlatformPei\MemDetect.c to PlatformInitLib\MemDetect.c.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

OvmfPkg/PlatformPei/Platform.h

@@ -34,18 +34,6 @@ PublishPeiMemory (
   VOID
   );
 
-UINT32
-EFIAPI
-PlatformGetSystemMemorySizeBelow4gb (
-  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
-  );
-
-VOID
-EFIAPI
-PlatformQemuUc32BaseInitialization (
-  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
-  );
-
 VOID
 InitializeRamRegions (
   IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob