ASoC: Intel: Skylake: Introduce single place for pipe-config selection

Provide a single location for pipe config selection where all fields
that have to be updated whenever ->pipe_config_idx changes can be
updated accordingly.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Tested-by: Lukasz Majczak <lma@semihlaf.com>
Link: https://lore.kernel.org/r/20221205085330.857665-5-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>