ALSA: hda - remove forced polling workaround for CFL and CNL

Remove the workarounds added in commit fa763f1 ("ALSA:
hda - Force polling mode on CNL for fixing codec communication")
and commit a8d7bde ("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 2756d91 ("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.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_intel.c

@@ -369,8 +369,6 @@ enum {
 					((pci)->device == 0x160c))
 
 #define IS_BXT(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0x5a98)
-#define IS_CFL(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0xa348)
-#define IS_CNL(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0x9dc8)
 
 static char *driver_short_names[] = {
 	[AZX_DRIVER_ICH] = "HDA Intel",
@@ -1763,10 +1761,6 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci,
 	if (!azx_snoop(chip))
 		azx_bus(chip)->dma_type = SNDRV_DMA_TYPE_DEV_UC;
 
-	/* Workaround for a communication error on CFL (bko#199007) and CNL */
-	if (IS_CFL(pci) || IS_CNL(pci))
-		azx_bus(chip)->polling_mode = 1;
-
 	if (chip->driver_type == AZX_DRIVER_NVIDIA) {
 		dev_dbg(chip->card->dev, "Enable delay in RIRB handling\n");
 		chip->bus.needs_damn_long_delay = 1;