dt-bindings: reset: renesas,rzg2l-usbphy-ctrl: Document RZ/V2L USBPHY Control bindings

Add device tree binding document for RZ/V2L USBPHY Control Device.
RZ/V2L USBPHY Control Device is identical to one found on the RZ/G2L SoC.
No driver changes are required as generic compatible string
"renesas,rzg2l-usbphy-ctrl" will be used as a fallback.

Signed-off-by: Lad Prabhakar <[e-mail]>
Reviewed-by: Biju Das <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml

···
 $id: http://devicetree.org/schemas/reset/renesas,rzg2l-usbphy-ctrl.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Renesas RZ/G2L USBPHY Control
+title: Renesas RZ/{G2L,V2L} USBPHY Control
 
 maintainers:
   - Biju Das <[e-mail]>
···
     items:
       - enum:
           - renesas,r9a07g044-usbphy-ctrl # RZ/G2{L,LC}
+          - renesas,r9a07g054-usbphy-ctrl # RZ/V2L
       - const: renesas,rzg2l-usbphy-ctrl
 
   reg: