Revert "dt-bindings: clock: renesas,rzg2l-cpg: Update #power-domain-cells = <1> for...

Revert "dt-bindings: clock: renesas,rzg2l-cpg: Update #power-domain-cells = <1> for RZ/G3S"

This reverts commit f33dca9ed6f41c8acf2c17c402738deddb7d7c28.

Since the configuration order between the individual MSTOP and CLKON
bits cannot be preserved with the power domain abstraction, drop the
power domain IDs.
Currently, there are no device tree users for #power-domain-cell = <1>.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/20250527112403.1254122-9-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>