ASoC: Intel: Skylake: Fix to remove channel_map calculation

Widget FW topology private data already has the information
on the channel map, ch_cfg and interleaving. This patch removes
the calculation of channel_map in driver and reads the value
directly from widget private data.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>