Remove the workarounds added in commit fa763f1b ("ALSA:
hda - Force polling mode on CNL for fixing codec communication")
and commit a8d7bde2 ("ALSA: hda - Force polling mode on CFL
for fixing codec communication").

The workarounds are no longer needed after the more generic
change done in commit 2756d914 ("ALSA: hda - Fix intermittent
CORB/RIRB stall on Intel chips"). This change applies to a larger
set of hardware and covers CFL and CNL as well.

Similar change was already done to SOF DSP HDA driver with
no regressions detected.
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191115124449.20512-4-kai.vehmanen@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>