As stated in SiL9022/24 datasheet, master clock is not required for I2S.
Make mclk property optional in DT bindings.
Fixes:
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|---|---|---|
| .. | ||
| bindings | ||
| booting-without-of.txt | ||
| changesets.txt | ||
| dynamic-resolution-notes.txt | ||
| of_unittest.txt | ||
| overlay-notes.txt | ||
| usage-model.txt | ||
| writing-schema.md | ||