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

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>