Some Madera CODECs have a third MCLK pin allow this to be sourced for
the FLLs and system clocks.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20191001135700.31017-1-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>