arm64: dts: renesas: Add DTSI for R9A09G087M44 variant of RZ/N2H

Add the device tree source include file for the R9A09G087M44 variant of
the Renesas RZ/N2H SoC, which features a 4-core configuration.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250617171957.162145-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r9a09g087m44.dtsi

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Source for the RZ/N2H 4-core SoC
+ *
+ * Copyright (C) 2025 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+#include "r9a09g087.dtsi"
+
+/ {
+	compatible = "renesas,r9a09g087m44", "renesas,r9a09g087";
+};