MLK-21940-4: ASoC: fsl_easrc: Support the m2m function

MLK-21940-4: ASoC: fsl_easrc: Support the m2m function

EASRC M2M function is not able to put upstream due to its self-designed
ioctl protocol. So make a single patch for it and make it merge
into P2P driver as simply as possible.

The patch can only be maintained internally unless some one designs a
new protocol or implement the originally protocol by using some common
approach provided by Linux Kernel.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Viorel Suman <viorel.suman@nxp.com>