dt-bindings: mmc: renesas,sdhi: Remove duplicate compatible and add clock checks

Remove the duplicate compatible entry `renesas,sdhi-r9a09g057` and add a
restriction for clocks and clock-names for the RZ/V2H(P) SoC, which has
four clocks similar to the RZ/G2L SoC.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 32842af74abc ("dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240805211257.61099-1-prabhakar.mahadev-lad.rj@bp.renesas.com


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