ASoC: codecs: tas5720: split a tas5720_mute_soc_component() function

This is to be re-used in tas5720_mute() (which is part of the dai_ops) and
also in the tas5720_fault_check_work() hook.

The benefit here isn't too great (now).
It's only when we add support for a new device with a slightly different
regmap that this becomes more useful.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>
Link: https://lore.kernel.org/r/20230128082744.41849-1-alex@shruggie.ro


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