ArmVirtPkg: Move two PCD variables into OvmfPkg

Move the PcdTerminalTypeGuidBuffer and PcdUninstallMemAttrProtocol into
OvmfPkg so other ARCH can easily use it.

Build-tested only (with "ArmVirtQemu.dsc and OvmfPkgX64.dsc").

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Chao Li <lichao@loongson.cn>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf

@@ -29,7 +29,6 @@
   QemuKernel.c
 
 [Packages]
-  ArmVirtPkg/ArmVirtPkg.dec
   MdeModulePkg/MdeModulePkg.dec
   MdePkg/MdePkg.dec
   OvmfPkg/OvmfPkg.dec
@@ -56,15 +55,15 @@
   UefiRuntimeServicesTableLib
 
 [FixedPcd]
-  gArmVirtTokenSpaceGuid.PcdUninstallMemAttrProtocol
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits
+  gUefiOvmfPkgTokenSpaceGuid.PcdUninstallMemAttrProtocol
 
 [Pcd]
-  gArmVirtTokenSpaceGuid.PcdTerminalTypeGuidBuffer
   gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut
+  gUefiOvmfPkgTokenSpaceGuid.PcdTerminalTypeGuidBuffer
 
 [Guids]
   gEfiEndOfDxeEventGroupGuid