dt-bindings: timer: renesas: ostm: Document Renesas RZ/V2L OSTM

Document the General Timer Module(a.k.a OSTM) found on the RZ/V2L SoC.
OSTM module is identical to one found RZ/G2L SoC. No driver changes are
required as generic compatible string "renesas,ostm" will be used as a
fallback.

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

Documentation/devicetree/bindings/timer/renesas,ostm.yaml

···
           - renesas,r7s72100-ostm  # RZ/A1H
           - renesas,r7s9210-ostm   # RZ/A2M
           - renesas,r9a07g044-ostm # RZ/G2{L,LC}
+          - renesas,r9a07g054-ostm # RZ/V2L
       - const: renesas,ostm        # Generic
 
   reg:
···
       contains:
         enum:
           - renesas,r9a07g044-ostm
+          - renesas,r9a07g054-ostm
 then:
   required:
     - resets