ArmVirtPkg: Move the FdtSerialPortAddressLib to OvmfPkg

Move the FdtSerialPortAddressLib to Ovmfpkg so that 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>

OvmfPkg/Library/FdtSerialPortAddressLib/FdtSerialPortAddressLib.inf

@@ -0,0 +1,27 @@
+## @file
+# Determine the base addresses of serial ports from the Device Tree.
+#
+# Copyright (C) Red Hat
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION    = 1.27
+  BASE_NAME      = FdtSerialPortAddressLib
+  FILE_GUID      = AEBE813B-25EA-40E5-95C4-2B864FE1E951
+  MODULE_TYPE    = BASE
+  VERSION_STRING = 1.0
+  LIBRARY_CLASS  = FdtSerialPortAddressLib
+
+[Sources]
+  FdtSerialPortAddressLib.c
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  FdtLib