arm64: dts: renesas: Add initial support for RZ/G3E SMARC SoM

Add initial support for the RZ/G3E SMARC SoM with 4GB memory,
audio_extal, qextal and rtxin clks.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241203105005.103927-12-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Source for the R9A09G047E57 SMARC SoM board.
+ *
+ * Copyright (C) 2024 Renesas Electronics Corp.
+ */
+
+/ {
+	compatible = "renesas,rzg3e-smarcm", "renesas,r9a09g047e57", "renesas,r9a09g047";
+
+	memory@48000000 {
+		device_type = "memory";
+		/* First 128MB is reserved for secure area. */
+		reg = <0x0 0x48000000 0x0 0xf8000000>;
+	};
+};
+
+&audio_extal_clk {
+	clock-frequency = <48000000>;
+};
+
+&qextal_clk {
+	clock-frequency = <24000000>;
+};
+
+&rtxin_clk {
+	clock-frequency = <32768>;
+};