dt-bindings: iio: adc: renesas,rzg2l-adc: Document RZ/Five SoC

The ADC block on the RZ/Five SoC is identical to one found on the RZ/G2UL
SoC. "renesas,r9a07g043-adc" compatible string will be used on the RZ/Five
SoC so to make this clear, update the comment to include RZ/Five SoC.

No driver changes are required as generic compatible string
"renesas,rzg2l-adc" will be used as a fallback on RZ/Five SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20221115124128.1183144-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>