dt-bindings: iio: adc: Document Renesas RZ/V2L ADC

Document renesas RZ/V2L ADC bindings. RZ/V2L ADC is identical to RZ/G2L
with same number of channels.

While at it remove RZ/G2LC SoC from binding documentation as it does not
support ADC.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220423131654.131390-1-biju.das.jz@bp.renesas.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml

@@ -19,7 +19,8 @@ properties:
   compatible:
     items:
       - enum:
-          - renesas,r9a07g044-adc   # RZ/G2{L,LC}
+          - renesas,r9a07g044-adc   # RZ/G2L
+          - renesas,r9a07g054-adc   # RZ/V2L
       - const: renesas,rzg2l-adc
 
   reg: