dt-bindings: media: renesas,vin: Add binding for V4M

Document support for the VIN module in the Renesas V4M (r8a779h0) SoC.
This device is compatible with the VIN module on the other Gen4 SoCs.

Signed-off-by: Niklas Söderlund <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Laurent Pinchart <[e-mail]>

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

···
           - enum:
               - renesas,vin-r8a779a0 # R-Car V3U
               - renesas,vin-r8a779g0 # R-Car V4H
+              - renesas,vin-r8a779h0 # R-Car V4M
           - const: renesas,rcar-gen4-vin # Generic R-Car Gen4
 
   reg: