arm64: dts: renesas: Add Renesas R8A779M7 SoC support

Add support for the Renesas R-Car D3e (R8A779M7) SoC, which is a
different grading of the R-Car D3 (R8A77995) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/2aa5b34d5b50f757092bc6442bb59a8534f2ff24.1628766192.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779m7.dtsi

+// SPDX-License-Identifier: (GPL-2.0 or MIT)
+/*
+ * Device Tree Source for the R-Car D3e (R8A779M7) SoC
+ *
+ * Copyright (C) 2021 Glider bv
+ */
+
+#include "r8a77995.dtsi"
+
+/ {
+	compatible = "renesas,r8a779m7", "renesas,r8a77995";
+};