skl_compute_wrpll: Cycle through dividers, then central freqs

Follow Paulo's comment on the corresponding kernel patch.

This means we also have to move the break when we have cycled through
the even dividers as well.

This improves the number of even dividers used across the tested
frequencies (373) (at the expense of a slightly worse average deviation,
but "even dividers take precedence over a lower deviation".

before:
  even/odd dividers: 338/35
  average deviation: 206.52

after:
  even/odd dividers: 363/10
  average deviation: 215.13

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
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