dt-bindings: mmc: renesas,sdhi: Document RZ/Five SoC

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

No driver changes are required as generic compatible string
"renesas,rcar-gen3-sdhi" will be used as a fallback on RZ/Five SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20231115203254.30544-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>