media: dt-bindings: media: renesas,fcp: Document RZ/V2N SoC

The FCPVD block on the RZ/V2N SoC is identical to the one found on the
RZ/G2L SoC.

No driver changes are required, as `renesas,fcpv` will be used as a
fallback compatible string on the RZ/V2N SoC.

Signed-off-by: Lad Prabhakar <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: Kieran Bingham <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

Documentation/devicetree/bindings/media/renesas,fcp.yaml

···
               - renesas,r9a07g043u-fcpvd # RZ/G2UL
               - renesas,r9a07g044-fcpvd # RZ/G2{L,LC}
               - renesas,r9a07g054-fcpvd # RZ/V2L
+              - renesas,r9a09g056-fcpvd # RZ/V2N
               - renesas,r9a09g057-fcpvd # RZ/V2H(P)
           - const: renesas,fcpv         # Generic FCP for VSP fallback