Revert "DynamicTablesPkg: Remove GIC Distributor Id field"

This reverts commit d3a15f435f.

Reverting this patch as Soft Feature Freeze for
edk2-stable201903 started on 22 Feb 2019.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Alexei Fedorov <alexei.fedorov@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Alexei Fedorov <alexei.fedorov@arm.com>

DynamicTablesPkg/Include/ArmNameSpaceObjects.h

@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2017 - 2019, ARM Limited. All rights reserved.
+  Copyright (c) 2017 - 2018, ARM Limited. All rights reserved.
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -166,6 +166,9 @@ typedef struct CmArmGicCInfo {
     GIC Distributor information for the Platform.
 */
 typedef struct CmArmGicDInfo {
+  /// The GIC Distributor ID.
+  UINT32  GicId;
+
   /// The Physical Base address for the GIC Distributor.
   UINT64  PhysicalBaseAddress;