arm64: dts: renesas: Add Renesas R8A779M2 SoC support

Add support for the Renesas R-Car M3e (R8A779M2) SoC, which is a
different grading of the R-Car M3-W+ (R8A77961) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/2303577cac91aa6d98e7f2c72e36841f6218e53f.1628766192.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779m2.dtsi

+// SPDX-License-Identifier: (GPL-2.0 or MIT)
+/*
+ * Device Tree Source for the R-Car M3e (R8A779M2) SoC
+ *
+ * Copyright (C) 2021 Glider bv
+ */
+
+#include "r8a77961.dtsi"
+
+/ {
+	compatible = "renesas,r8a779m2", "renesas,r8a77961";
+};