REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3246

MdeLibs.dsc.inc was added for some basic/default library
instances provided by MdePkg and RegisterFilterLibNull Library
was also added into it as the first version of MdeLibs.dsc.inc.

So update platform dsc to consume MdeLibs.dsc.inc for
RegisterFilterLibNull which will be consumed by IoLib and BaseLib.

Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 PcAtChipsetPkg/PcAtChipsetPkg.dsc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/PcAtChipsetPkg/PcAtChipsetPkg.dsc b/PcAtChipsetPkg/PcAtChipsetPkg.dsc
index 3d1fb816f5..8598e689f9 100644
--- a/PcAtChipsetPkg/PcAtChipsetPkg.dsc
+++ b/PcAtChipsetPkg/PcAtChipsetPkg.dsc
@@ -1,9 +1,9 @@
 ## @file
 #  PC/AT Chipset Package
 #
-#  Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2007 - 2021, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2020, AMD Incorporated. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 ##
@@ -17,10 +17,12 @@ [Defines]
   SUPPORTED_ARCHITECTURES        = IA32|X64
   BUILD_TARGETS                  = DEBUG|RELEASE|NOOPT
   SKUID_IDENTIFIER               = DEFAULT
 
 [LibraryClasses]
+  !include MdePkg/MdeLibs.dsc.inc
+
   BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
   BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
   DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
   DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
   DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
--
2.18.0.windows.1