OvmfPkg/PlatformPei: remove Xen support

The "OvmfPkg/PlatformPei/PlatformPei.inf" module is used by the following
platform DSCs:

  OvmfPkg/AmdSev/AmdSevX64.dsc
  OvmfPkg/OvmfPkgIa32.dsc
  OvmfPkg/OvmfPkgIa32X64.dsc
  OvmfPkg/OvmfPkgX64.dsc

Remove Xen support from "OvmfPkg/PlatformPei", including any dependencies
that now become unused. The basic idea is to substitute FALSE for "mXen".

Remove "OvmfPkg/PlatformPei" from the "OvmfPkg: Xen-related modules"
section of "Maintainers.txt".

This patch is best reviewed with "git show -b -W".

Cc: Andrew Fish <afish@apple.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210526201446.12554-22-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>

OvmfPkg/PlatformPei/PlatformPei.inf

@@ -33,8 +33,6 @@
   MemTypeInfo.c
   Platform.c
   Platform.h
-  Xen.c
-  Xen.h
 
 [Packages]
   EmbeddedPkg/EmbeddedPkg.dec
@@ -46,7 +44,6 @@
 
 [Guids]
   gEfiMemoryTypeInformationGuid
-  gEfiXenInfoGuid
 
 [LibraryClasses]
   BaseLib
@@ -96,7 +93,6 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
   gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
   gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvStoreReserved
-  gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode
   gEfiMdeModulePkgTokenSpaceGuid.PcdUse1GPageTable
   gEfiMdeModulePkgTokenSpaceGuid.PcdSetNxForStack