clk: meson: mpll: Switch from .round_rate to .determine_rate

clk_ops.round_rate will be removed at some point. It's replacement is
.determine_rate. Switch clk-mpll over to use .determine_rate.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20221225212632.2760126-2-martin.blumenstingl@googlemail.com


Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>