plat/arm/rddaniel: enabled GICv4 extension

RD-Daniel uses GIC-Clayton as its interrupt controller which is an
implementation of GICv4.1 architecture. Hence for RD-Daniel, enable
GICv4 extension support.

Change-Id: I45ae8c82376f8fe8fc0666306822ae2db74e71b8
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>

plat/arm/board/rddaniel/platform.mk

@@ -3,6 +3,9 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
+# RD-Daniel platform uses GIC-Clayton which is based on GICv4.1
+GIC_ENABLE_V4_EXTN	:=	1
+
 include plat/arm/css/sgi/sgi-common.mk
 
 RDDANIEL_BASE		=	plat/arm/board/rddaniel