dt-bindings: clock: rzg2l: Drop power domain IDs

dt-bindings: clock: rzg2l: Drop power domain IDs

Since the configuration order between the individual MSTOP and CLKON
bits cannot be preserved with the power domain abstraction, drop the
power domain IDs.  The corresponding code has also been removed.
Currently, there are no device tree users for these IDs.

Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/20250527112403.1254122-8-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>