ASoC: cs42l43: Refactor to use for_each_set_bit()

Refactor the code in cs42l43_mask_to_slots() to use for_each_set_bit().

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://msgid.link/r/20240125103117.2622095-6-ckeepax@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>