dt-bindings: i2c: renesas,riic: Document RZ/G2UL SoC

Document RZ/G2UL I2C bindings. RZ/G2UL I2C is identical to one found on
the RZ/G2L SoC. No driver changes are required as RZ/G2L compatible
string "renesas,riic-rz" will be used as a fallback.

Signed-off-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/i2c/renesas,riic.yaml

···
       - enum:
           - renesas,riic-r7s72100   # RZ/A1H
           - renesas,riic-r7s9210    # RZ/A2M
+          - renesas,riic-r9a07g043  # RZ/G2UL
           - renesas,riic-r9a07g044  # RZ/G2{L,LC}
           - renesas,riic-r9a07g054  # RZ/V2L
       - const: renesas,riic-rz      # RZ/A or RZ/G2L
···
     compatible:
       contains:
         enum:
+          - renesas,riic-r9a07g043
           - renesas,riic-r9a07g044
           - renesas,riic-r9a07g054
 then: