ArmVirtPkg: Add PCIe host bridge utility lib for ArmVirtPkg

PCIe support has been added to Kvmtool Virtual Machine Manager.
The PCI host bridge utility lib is used to retrieve information
about the Root Bridges in a platform.
Therefore, add an instance of PciHostBridgeUtilityLib as this is
required to enable PCIe support for Kvmtool firmware.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>

ArmVirtPkg/Library/ArmVirtPciHostBridgeUtilityLib/ArmVirtPciHostBridgeUtilityLib.inf

@@ -0,0 +1,39 @@
+## @file
+#  PciHostBridgeLib utility functions for ArmVirt.
+#
+#  Copyright (c) 2021, Arm Limited. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = ArmVirtPciHostBridgeUtilityLib
+  FILE_GUID                      = 22A8844E-2AE7-4BF1-91FA-6EFDE3FE540C
+  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           = AARCH64 ARM
+#
+
+[Sources]
+  ArmVirtPciHostBridgeUtilityLib.c
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  BaseMemoryLib
+  DebugLib
+  DevicePathLib
+  MemoryAllocationLib
+  PciLib