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/Include/Library/PciHostBridgeUtilityLib.h

@@ -0,0 +1,38 @@
+/** @file
+  Provide common utility functions to PciHostBridgeLib instances in
+  ArmVirtPkg and OvmfPkg.
+
+  Copyright (C) 2016, Red Hat, Inc.
+  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2020, Huawei Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __PCI_HOST_BRIDGE_UTILITY_LIB_H__
+#define __PCI_HOST_BRIDGE_UTILITY_LIB_H__
+
+
+/**
+  Utility function to inform the platform that the resource conflict happens.
+
+  @param[in] Configuration  Pointer to PCI I/O and PCI memory resource
+                            descriptors. The Configuration contains the
+                            resources for all the root bridges. The resource
+                            for each root bridge is terminated with END
+                            descriptor and an additional END is appended
+                            indicating the end of the entire resources. The
+                            resource descriptor field values follow the
+                            description in
+                            EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
+                            .SubmitResources().
+**/
+VOID
+EFIAPI
+PciHostBridgeUtilityResourceConflict (
+  IN VOID  *Configuration
+  );
+
+
+#endif // __PCI_HOST_BRIDGE_UTILITY_LIB_H__