ArmPkg: Add ArmTransferListHob Guid

ArmTransferListHobGuid will hold the TransferList base address
https://firmwarehandoff.github.io/firmware_handoff

Signed-off-by: Prachotan Reddy Bathi <Prachotan.Bathi@arm.com>

ArmPkg/ArmPkg.dec

@@ -87,6 +87,8 @@
   # Include/Guid/ArmMpCoreInfo.h
   gArmMpCoreInfoGuid = { 0xa4ee0728, 0xe5d7, 0x4ac5,  {0xb2, 0x1e, 0x65, 0x8e, 0xd8, 0x57, 0xe8, 0x34} }
 
+  gArmTransferListHobGuid = { 0xebe7bae8, 0xfe18, 0x43c5, { 0xbf, 0x3f, 0xf2, 0xb1, 0xaf, 0xb2, 0xdf, 0xb8 } }
+
 [Protocols.common]
   ## Arm System Control and Management Interface(SCMI) Base protocol
   ## ArmPkg/Include/Protocol/ArmScmiBaseProtocol.h

ArmPkg/Include/Guid/TransferListHob.h

@@ -0,0 +1,23 @@
+/** @file
+  GUID for the HOB that contains the copy of the Transfer List
+
+  Copyright (C) 2024, Arm Limited. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Reference(s):
+    - https://github.com/FirmwareHandoff/firmware_handoff
+
+**/
+
+#ifndef ARM_TRANSFER_LIST_HOB_H__
+#define ARM_TRANSFER_LIST_HOB_H__
+
+#define ARM_TRANSFER_LIST_HOB_GUID  {\
+          0xebe7bae8, 0xfe18, 0x43c5, \
+          { 0xbf, 0x3f, 0xf2, 0xb1, 0xaf, 0xb2, 0xdf, 0xb8 } \
+        }
+
+extern EFI_GUID  gArmTransferListHobGuid;
+
+#endif