clk: renesas: rzg2l: convert from round_rate() to determine_rate()

clk: renesas: rzg2l: convert from round_rate() to determine_rate()

The round_rate() clk ops is deprecated, so migrate this driver from
round_rate() to determine_rate() using the Coccinelle semantic patch
on the cover letter of this series.

Signed-off-by: Brian Masney <bmasney@redhat.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250811-clk-for-stephen-round-rate-v1-92-b3bf97b038dc@redhat.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>