drivers: renesas: ddr: Move to common

Move ddr driver code to common directory, so that the same
code can be re-used by both R-Car Gen3 and RZ/G2 platforms.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Change-Id: I9aef73d3e9a027a127ce7483b72d339559866727
diff --git a/plat/renesas/rcar/platform.mk b/plat/renesas/rcar/platform.mk
index 5e4978c..7a7a56c 100644
--- a/plat/renesas/rcar/platform.mk
+++ b/plat/renesas/rcar/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
 #
@@ -293,12 +293,12 @@
   endif
 endif
 
-include drivers/renesas/rcar/ddr/ddr.mk
+include drivers/renesas/common/ddr/ddr.mk
 include drivers/renesas/rcar/qos/qos.mk
 include drivers/renesas/rcar/pfc/pfc.mk
 include lib/libfdt/libfdt.mk
 
-PLAT_INCLUDES	+=	-Idrivers/renesas/rcar/ddr		\
+PLAT_INCLUDES	+=	-Idrivers/renesas/common/ddr		\
 			-Idrivers/renesas/rcar/qos		\
 			-Idrivers/renesas/rcar/board		\
 			-Idrivers/renesas/rcar/cpld/		\