TF-A GICv3 driver: Separate GICD and GICR accessor functions

This patch provides separation of GICD, GICR accessor
functions and adds new macros for GICv3 registers access
as a preparation for GICv3.1 and GICv4 support.
NOTE: Platforms need to modify to include both
'gicdv3_helpers.c' and 'gicrv3_helpers.c' instead of the
single helper file previously.

Change-Id: I1641bd6d217d6eb7d1228be3c4177b2d556da60a
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
diff --git a/plat/imx/imx8qx/platform.mk b/plat/imx/imx8qx/platform.mk
index d5629d1..5e8ba06 100644
--- a/plat/imx/imx8qx/platform.mk
+++ b/plat/imx/imx8qx/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -8,6 +8,8 @@
 				-Iplat/imx/common/include		\
 
 IMX_GIC_SOURCES	:=		drivers/arm/gic/v3/gicv3_helpers.c	\
+				drivers/arm/gic/v3/gicdv3_helpers.c	\
+				drivers/arm/gic/v3/gicrv3_helpers.c	\
 				drivers/arm/gic/v3/arm_gicv3_common.c	\
 				drivers/arm/gic/v3/gic500.c		\
 				drivers/arm/gic/v3/gicv3_main.c		\