dt-bindings: gpu: mali-bifrost: Add compatible for RZ/V2N SoC

dt-bindings: gpu: mali-bifrost: Add compatible for RZ/V2N SoC

Add a compatible string for the Renesas RZ/V2N SoC variants that include a
Mali-G31 GPU. These variants share the same restrictions on interrupts,
clocks, and power domains as the RZ/G2L SoC, so extend the existing schema
validation accordingly.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20250502162540.165962-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>