ASoC: fsl_sai: Set MCLK input or output direction

SAI support select MCLK direction with version.major > 3
and version.minor > 1, the default direction is input,
set it to be output according to DT property.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/1600323079-5317-4-git-send-email-shengjiu.wang@nxp.com


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