ASoC: dt-bindings: maxim,max9867: add clocks property

Add clocks property to require a "mclk" definition for the
maxim,max9867 codec.

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Link: https://lore.kernel.org/r/20230302-max9867-v2-2-fd2036d5e825@skidata.com


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