DynamicTablesPkg: add package .dsc file

Having a top-level .dsc makes it easier to perform standalone build
tests of the core code, so add one.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/DynamicTablesPkg.dsc

@@ -0,0 +1,44 @@
+## @file
+#  Dsc file for Dynamic Tables Framework.
+#
+#  Copyright (c) 2019, Linaro Limited. All rights reserved.<BR>
+#
+#  This program and the accompanying materials are licensed and made available
+#  under the terms and conditions of the BSD License which accompanies this
+#  distribution.  The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
+#  IMPLIED.
+#
+##
+
+[Defines]
+  PLATFORM_NAME                  = DynamicTables
+  PLATFORM_GUID                  = f39096a0-7a0a-442a-9413-cf584ef80cbb
+  PLATFORM_VERSION               = 0.1
+  DSC_SPECIFICATION              = 0x0001001a
+  OUTPUT_DIRECTORY               = Build/DynamicTables
+  SUPPORTED_ARCHITECTURES        = ARM|AARCH64
+  BUILD_TARGETS                  = DEBUG|RELEASE|NOOPT
+  SKUID_IDENTIFIER               = DEFAULT
+
+!include DynamicTables.dsc.inc
+
+[LibraryClasses]
+  BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
+  BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
+  DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
+  IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
+  MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
+  PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
+  PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
+  UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
+  UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
+
+[LibraryClasses.ARM, LibraryClasses.AARCH64]
+  PL011UartLib|ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf
+
+[Components.common]
+  DynamicTablesPkg/Library/Common/TableHelperLib/TableHelperLib.inf