clk: mmp: Switch to use struct u32_fract instead of custom one

clk: mmp: Switch to use struct u32_fract instead of custom one

The struct mmp_clk_factor_tbl repeats the generic struct u32_fract.
Kill the custom one and use the generic one instead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Duje Mihanović <duje.mihanovic@skole.hr>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>