ASoC: Intel: Skylake: Drop pipe_config_idx

Field ->pipe_config_idx duplicates the job of ->cur_config_idx so
remove it.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Tested-by: Lukasz Majczak <lma@semihlaf.com>
Link: https://lore.kernel.org/r/20221205085330.857665-4-cezary.rojewski@intel.com


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