ASoC: fsl_ssi: Add support multi fifo script

With dual fifo enabled, the case that recording mono sound
in the background, playback mono sound twice in parallal,
at second time playback sound may distort, the possible
reason is using dual fifo to playback mono sound is not
recommended.

This patch is to provide a option to use multi fifo script,
which can be dynamically configured as one fifo or two fifo
mode.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1652183808-3745-1-git-send-email-shengjiu.wang@nxp.com


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