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/plat/renesas/rcar/include/rcar_def.h b/plat/renesas/rcar/include/rcar_def.h
index 9bf418f..ac7dc17 100644
--- a/plat/renesas/rcar/include/rcar_def.h
+++ b/plat/renesas/rcar/include/rcar_def.h
@@ -151,6 +151,7 @@
 #define RCAR_CUT_MASK			U(0x000000FF)
 #define RCAR_PRODUCT_H3			U(0x00004F00)
 #define RCAR_PRODUCT_M3			U(0x00005200)
+#define RCAR_PRODUCT_V3M		U(0x00005400)
 #define RCAR_PRODUCT_M3N		U(0x00005500)
 #define RCAR_PRODUCT_E3			U(0x00005700)
 #define RCAR_PRODUCT_D3			U(0x00005800)