arm64: dts: r8a7796: Add Renesas R8A7796 SoC support

Basic support for the Gen 3 R-Car M3-W SoC.

Based on work for the r8a7795 and r8a7796 SoCs by
Takeshi Kihara, Dirk Behme and Geert Uytterhoeven.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 7ef1d05..2182fd5 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -121,6 +121,12 @@
 	help
 	  This enables support for the Renesas R-Car H3 SoC.
 
+config ARCH_R8A7796
+	bool "Renesas R-Car M3-W SoC Platform"
+	depends on ARCH_RENESAS
+	help
+	  This enables support for the Renesas R-Car M3-W SoC.
+
 config ARCH_STRATIX10
 	bool "Altera's Stratix 10 SoCFPGA Family"
 	help