ASoC: mmp-sspa: Set appropriate bus format for given bit width

ASoC: mmp-sspa: Set appropriate bus format for given bit width

The values set by set_dai_fmt() and hw_params() seem to be tailored only
for 32-bit formats. Negotiate the correct ones in hw_params() callback
instead.

This was essentially copied from the OLPC kernel driver and tested to
fix wrong audio output for non-32bit formats. The documentation is not
available.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200511210134.1224532-10-lkundrak@v3.sk
Signed-off-by: Mark Brown <broonie@kernel.org>