drivers: renesas: rzg: Switch using common ddr code

Switch using common ddr driver code from renesas/common/ddr directory
for RZ/G2M SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Change-Id: I807dcb0bc5186bd32bc1c577945d28634bb10e1f
diff --git a/plat/renesas/rzg/platform.mk b/plat/renesas/rzg/platform.mk
index 421cbbe..43c243d 100644
--- a/plat/renesas/rzg/platform.mk
+++ b/plat/renesas/rzg/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018-2020, Renesas Electronics Corporation. All rights reserved.
+# Copyright (c) 2018-2021, Renesas Electronics Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -168,12 +168,15 @@
 endif
 $(eval $(call add_define,RCAR_SYSTEM_RESET_KEEPON_DDR))
 
-include drivers/renesas/rzg/ddr/ddr.mk
+RZG_SOC :=1
+$(eval $(call add_define,RZG_SOC))
+
+include drivers/renesas/common/ddr/ddr.mk
 include drivers/renesas/rzg/qos/qos.mk
 include drivers/renesas/rzg/pfc/pfc.mk
 include lib/libfdt/libfdt.mk
 
-PLAT_INCLUDES	+=	-Idrivers/renesas/rzg/ddr		\
+PLAT_INCLUDES	+=	-Idrivers/renesas/common/ddr		\
 			-Idrivers/renesas/rzg/qos		\
 			-Idrivers/renesas/rzg/board		\
 			-Idrivers/renesas/common		\