ASoC: Intel: Skylake: Fix to delete DSP pipe after stopping pipe

DSP pipe needs to stopped before deleting the pipe. Currently check is
for pipe state > STARTED, which is incorrect. So changed to include
pipe state STARTED to stop the pipe if it started.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>