dt-bindings: timer: renesas: ostm: Document Renesas RZ/G2UL OSTM

Document the General Timer Module(a.k.a OSTM) found on the RZ/G2UL 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: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220425141828.197321-1-biju.das.jz@bp.renesas.com

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

@@ -23,6 +23,7 @@ properties:
       - enum:
           - renesas,r7s72100-ostm  # RZ/A1H
           - renesas,r7s9210-ostm   # RZ/A2M
+          - renesas,r9a07g043-ostm # RZ/G2UL
           - renesas,r9a07g044-ostm # RZ/G2{L,LC}
           - renesas,r9a07g054-ostm # RZ/V2L
       - const: renesas,ostm        # Generic
@@ -54,6 +55,7 @@ if:
     compatible:
       contains:
         enum:
+          - renesas,r9a07g043-ostm
           - renesas,r9a07g044-ostm
           - renesas,r9a07g054-ostm
 then: