arm64: dts: renesas: Add r8a77980a.dtsi

This patch adds r8a77980A V3H2 (= r8a77980 ES2) basic SoC
support. It is using r8a77980 (= V3H) setting as-is for now.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87zgfm4nkw.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a77980a.dtsi

+// SPDX-License-Identifier: (GPL-2.0 or MIT)
+/*
+ * Device Tree Source for the R-Car V3H2 (R8A77980A) SoC
+ *
+ * Copyright (C) 2022 Renesas Electronics Corp.
+ */
+#include "r8a77980.dtsi"
+
+/ {
+	compatible = "renesas,r8a77980a", "renesas,r8a77980";
+};