OvmfPkg: Introduce PciHostBridgeUtilityLib class

Introduce a new PciHostBridgeUtilityLib class to share duplicate code
between OvmfPkg and ArmVirtPkg.

Extract function PciHostBridgeUtilityResourceConflict from
PciHostBridgeResourceConflict in OvmfPkg/PciHostBridgeLib.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3059

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Peter Grehan <grehan@freebsd.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Julien Grall <julien@xen.org>
Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Yubo Miao <miaoyubo@huawei.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210119011302.10908-2-cenjiahui@huawei.com>

OvmfPkg/Library/PciHostBridgeUtilityLib/PciHostBridgeUtilityLib.inf

@@ -0,0 +1,37 @@
+## @file
+#  Provide common utility functions to PciHostBridgeLib instances in
+#  ArmVirtPkg and OvmfPkg.
+#
+#  Copyright (C) 2016, Red Hat, Inc.
+#  Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2020, Huawei Corporation. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = PciHostBridgeUtilityLib
+  FILE_GUID                      = e3aa5932-527a-42e7-86f5-81b144c7e5f1
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PciHostBridgeUtilityLib
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 AARCH64 ARM
+#
+
+[Sources]
+  PciHostBridgeUtilityLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  DebugLib