clk: meson: s4: pll: hifi_pll support fractional multiplier

The s4's hifi_pll supports a fractional frequency multiplier, but frac
parameters are not configured in the driver.

Signed-off-by: Chuan Liu <chuan.liu@amlogic.com>
Link: https://lore.kernel.org/r/20240906-fix_clk-v1-3-2977ef0d72e7@amlogic.com


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