dt-bindings: usb: renesas,usbhs: Document RZ/V2L bindings

Document RZ/V2L (R9A07G054) SoC bindings. USBHS block is identical to one
found on RZ/A2 SoC. No driver changes are required as generic compatible
string "renesas,rza2-usbhs" 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]>
Acked-by: Yoshihiro Shimoda <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/usb/renesas,usbhs.yaml

···
           - enum:
               - renesas,usbhs-r7s9210   # RZ/A2
               - renesas,usbhs-r9a07g044 # RZ/G2{L,LC}
+              - renesas,usbhs-r9a07g054 # RZ/V2L
           - const: renesas,rza2-usbhs
 
       - items:
···
       properties:
         compatible:
           contains:
-            const: renesas,usbhs-r9a07g044
+            enum:
+              - renesas,usbhs-r9a07g044
+              - renesas,usbhs-r9a07g054
     then:
       properties:
         interrupts: