ASoC: amd: Removing unnecessary instance initialization

In trigger we already get the selected instance details
from runtime->private_data.So, removing the local
initialization which may corrupt the instance selected
details and this leads to corrupt data.

Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@amd.com>
Link: https://lore.kernel.org/r/20200618072624.27047-1-Vishnuvardhanrao.Ravulapati@amd.com


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