clk: rockchip: 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/58e1950566e40e2fbb31004baee57a164ca6a390.1680423909.git.christophe.jaillet@wanadoo.fr


Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>