spi: dt-bindings: renesas,rzv2h-rspi: Document RZ/V2N SoC support

Document the RSPI controller on the Renesas RZ/V2N SoC. The block is
compatible with the RSPI implementation found on the RZ/V2H(P) family.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251126131619.136605-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: prabhakarlad

Documentation/devicetree/bindings/spi/renesas,rzv2h-rspi.yaml

@@ -15,6 +15,9 @@ properties:
       - enum:
           - renesas,r9a09g057-rspi # RZ/V2H(P)
           - renesas,r9a09g077-rspi # RZ/T2H
+      - items:
+          - const: renesas,r9a09g056-rspi # RZ/V2N
+          - const: renesas,r9a09g057-rspi
       - items:
           - const: renesas,r9a09g087-rspi # RZ/N2H
           - const: renesas,r9a09g077-rspi # RZ/T2H