linux-phytec-fsl

MLK-14316 ASoC: fsl_ssi: Fix playback and capture with mono stream

After starting playback with a single channel SSI runs in Normal mode
(SCR.net = 0b, SCR.i2s_mode = 00b). But, if starting also capture
in parallel with playback the SSI mode changes which breaks the playback.

This happens because, we can change SSI mode from two distinct places:
	* _fsl_ssi_set_dai_fmt
	* fsl_ssi_hw_params

When running playback and capture in parallel for a mono channel, changing
hw params for the second stream will have no effect.

This patch allows changing the mode only from fsl_ssi_hw_parms so that
we have an atomic view of SSI mode.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>