arm64: dts: renesas: Add Renesas R8A779M3 SoC support

Add support for the Renesas R-Car M3e-2G (R8A779M3) SoC, which is a
different grading of the R-Car M3-W+ (R8A77961) SoC.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/bbb3131ccdd615b59c46297c2ea37147c7ff84e1.1626708063.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779m3.dtsi

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: (GPL-2.0 or MIT)
+/*
+ * Device Tree Source for the R-Car M3e-2G (R8A779M3) SoC
+ *
+ * Copyright (C) 2021 Glider bv
+ */
+
+#include "r8a77961.dtsi"
+
+/ {
+	compatible = "renesas,r8a779m3", "renesas,r8a77961";
+};