ASoC: Intel: Revert "ASoC: Intel: Add support for PM ops in bxt-rt298"

This reverts commit 3513798c ("ASoC: Intel: Add support for
PM ops in bxt-rt298") as the right way to fix this is to disable
async suspend

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