ASoC: Intel: Skylake: Reset pipeline before its deletion

Before actual deletion, pipeline should enter RESET state. Currently,
pipe skips this checkpoint and goes straight to the finish line.
This is not the expected path by the FW, so correct it.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>