clk: Remove mmask and nmask fields in struct clk_fractional_divider

clk: Remove mmask and nmask fields in struct clk_fractional_divider

All users of these fields have been removed.
They are now computed when needed with [mn]shift and [mn]width.

This shrinks the size of struct clk_fractional_divider from 72 to 56 bytes.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/680357e5acb338433bfc94114b65b4a4ce2c99e2.1680423909.git.christophe.jaillet@wanadoo.fr
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>