platform/arm/sgi: add multi-chip mode parameter in HW_CONFIG dts

Include multi-chip-mode parameter in HW_CONFIG dts to let next stage of
boot firmware know about the multi-chip operation mode.

Change-Id: Ic7535c2280fd57180ad14aa0ae277cf0c4d1337b
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
diff --git a/plat/arm/board/rde1edge/fdts/rde1edge_nt_fw_config.dts b/plat/arm/board/rde1edge/fdts/rde1edge_nt_fw_config.dts
index 4176921..0af821e 100644
--- a/plat/arm/board/rde1edge/fdts/rde1edge_nt_fw_config.dts
+++ b/plat/arm/board/rde1edge/fdts/rde1edge_nt_fw_config.dts
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -17,6 +17,7 @@
 	system-id {
 		platform-id = <0x0>;
 		config-id = <0x0>;
+		multi-chip-mode = <0x0>;
 	};
 
 };