ASoC: AMD: Clear format bits before setting them

This avoids residual bit form previous format when the format is changed.
Hence, the resultant format is not an invalid one.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@amd.com>
Link: https://lore.kernel.org/r/20200328093921.32211-1-akshu.agrawal@amd.com


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