rcar_gen3: plat: Add R-Car V3M support

Add R-Car V3M support. This is based on the original
V3M support patch for Yocto v2.23.1 by Vladimir Barinov.

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
---
Marek: Update on top of mainline ATF/master
diff --git a/drivers/staging/renesas/rcar/ddr/ddr.mk b/drivers/staging/renesas/rcar/ddr/ddr.mk
index a73d227..ed7adc3 100644
--- a/drivers/staging/renesas/rcar/ddr/ddr.mk
+++ b/drivers/staging/renesas/rcar/ddr/ddr.mk
@@ -9,6 +9,8 @@
     BL2_SOURCES += drivers/staging/renesas/rcar/ddr/dram_sub_func.c
 else ifeq (${RCAR_LSI},${RCAR_D3})
     include drivers/staging/renesas/rcar/ddr/ddr_a/ddr_a.mk
+else ifeq (${RCAR_LSI},${RCAR_V3M})
+    include drivers/staging/renesas/rcar/ddr/ddr_a/ddr_a.mk
 else
     include drivers/staging/renesas/rcar/ddr/ddr_b/ddr_b.mk
     BL2_SOURCES += drivers/staging/renesas/rcar/ddr/dram_sub_func.c