ASoC: tas2764: Fix mute/unmute

ASoC: tas2764: Fix mute/unmute

Because the PWR_CTRL field is modeled as the power state of the DAC
widget, and at the same time it is used to implement mute/unmute, we
need some additional book-keeping to have the right end result no matter
the sequence of calls. Without this fix, one permanently mutes an
ongoing stream by toggling the associated speaker pin control.

(This mirrors commit d52f46346c89 ("ASoC: tas2770: Fix handling of
mute/unmute") which was a fix to the tas2770 driver.)

Fixes: b3c709a3060c ("ASoC: tas2764: Add the driver for the TAS2764")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220825140241.53963-4-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org>