morello: Add changes to fix build of Morello Platform

This patch makes changes required to get the morello
platform working with the tip of TF-A.

Change-Id: I095006615c9959bba49fcc75b52e1de7d7486309
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
diff --git a/plat/arm/board/morello/platform.mk b/plat/arm/board/morello/platform.mk
index f62cd67..2a23bc6 100644
--- a/plat/arm/board/morello/platform.mk
+++ b/plat/arm/board/morello/platform.mk
@@ -12,12 +12,15 @@
 
 MORELLO_CPU_SOURCES	:=	lib/cpus/aarch64/rainier.S
 
-MORELLO_GIC_SOURCES	:=	drivers/arm/gic/common/gic_common.c	\
-				drivers/arm/gic/v3/gicv3_main.c		\
-				drivers/arm/gic/v3/gicv3_helpers.c	\
+# GIC-600 configuration
+GICV3_SUPPORT_GIC600	:=	1
+
+# Include GICv3 driver files
+include drivers/arm/gic/v3/gicv3.mk
+
+MORELLO_GIC_SOURCES	:=	${GICV3_SOURCES}			\
 				plat/common/plat_gicv3.c		\
 				plat/arm/common/arm_gicv3.c		\
-				drivers/arm/gic/v3/gic600.c
 
 PLAT_BL_COMMON_SOURCES	:=	${MORELLO_BASE}/morello_plat.c		\
 				${MORELLO_BASE}/aarch64/morello_helper.S