ASoC: nau8822: add MCLK support

Merge series from Andrejs Cainikovs <andrejs.cainikovs@gmail.com>:

This change adds local MCLK handling, which would cover a case when a
reference audio clock is present in a system, but is not allowed to be
changed, see [1].

[1]: https://lore.kernel.org/all/ZfBdxrzX3EnPuGOn@ediswmail9.ad.cirrus.com/