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

drivers/renesas/rcar/ddr/ddr.mk → drivers/renesas/common/ddr/ddr.mk

 #
-# Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+# Copyright (c) 2015-2021, Renesas Electronics Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 ifeq (${RCAR_LSI},${RCAR_E3})
-    include drivers/renesas/rcar/ddr/ddr_a/ddr_a.mk
-    BL2_SOURCES += drivers/renesas/rcar/ddr/dram_sub_func.c
+    include drivers/renesas/common/ddr/ddr_a/ddr_a.mk
+    BL2_SOURCES += drivers/renesas/common/ddr/dram_sub_func.c
 else ifeq (${RCAR_LSI},${RCAR_D3})
-    include drivers/renesas/rcar/ddr/ddr_a/ddr_a.mk
+    include drivers/renesas/common/ddr/ddr_a/ddr_a.mk
 else ifeq (${RCAR_LSI},${RCAR_V3M})
-    include drivers/renesas/rcar/ddr/ddr_a/ddr_a.mk
+    include drivers/renesas/common/ddr/ddr_a/ddr_a.mk
 else
-    include drivers/renesas/rcar/ddr/ddr_b/ddr_b.mk
-    BL2_SOURCES += drivers/renesas/rcar/ddr/dram_sub_func.c
+    include drivers/renesas/common/ddr/ddr_b/ddr_b.mk
+    BL2_SOURCES += drivers/renesas/common/ddr/dram_sub_func.c
 endif

drivers/renesas/rcar/ddr/ddr_a/ddr_a.mk → drivers/renesas/common/ddr/ddr_a/ddr_a.mk

 #
-# Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+# Copyright (c) 2015-2021, Renesas Electronics Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 ifeq (${RCAR_LSI},${RCAR_E3})
-BL2_SOURCES += drivers/renesas/rcar/ddr/ddr_a/ddr_init_e3.c
+BL2_SOURCES += drivers/renesas/common/ddr/ddr_a/ddr_init_e3.c
 else ifeq (${RCAR_LSI},${RCAR_D3})
-BL2_SOURCES += drivers/renesas/rcar/ddr/ddr_a/ddr_init_d3.c
+BL2_SOURCES += drivers/renesas/common/ddr/ddr_a/ddr_init_d3.c
 else
-BL2_SOURCES += drivers/renesas/rcar/ddr/ddr_a/ddr_init_v3m.c
+BL2_SOURCES += drivers/renesas/common/ddr/ddr_a/ddr_init_v3m.c
 endif

drivers/renesas/rcar/ddr/ddr_b/ddr_b.mk → drivers/renesas/common/ddr/ddr_b/ddr_b.mk

 #
-# Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+# Copyright (c) 2015-2021, Renesas Electronics Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-BL2_SOURCES += drivers/renesas/rcar/ddr/ddr_b/boot_init_dram.c
+BL2_SOURCES += drivers/renesas/common/ddr/ddr_b/boot_init_dram.c

plat/renesas/rcar/platform.mk

 #
-# 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 @@ ifeq (${RCAR_SYSTEM_RESET_KEEPON_DDR},1)
   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/		\