clk: renesas: rzg2l-cpg: Use devres API to register clocks

We are using devres APIs for divider, mux and pll5 clocks so for
consistency use the devres APIs for module, fixed factor and PLL clocks.

While at it switched to clk_hw_register() instead of clk_register()
as this has been marked as deprecated interface.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20240715103555.507767-2-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>