clk: imx: Remove values for mmask and nmask in struct clk_fractional_divider

Now that fractional_divider clk computes mmask and nmask when needed, there
is no more need to provide them explicitly anymore.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/187a2266c3a034a593a151d6e5e6b21118043b5d.1680423909.git.christophe.jaillet@wanadoo.fr


Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>