Revert "ASoC: SOF: Force polling mode on CFL and CNL"

This reverts commit 64ca9d9f.

The workaround is no longer needed after configuring HDAC
bus with sync_write=1.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191008164443.1358-3-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>