sunxi:pcm-audio: Fix BUG() after pcmaudio suspend/resume

Reuse Hans de Goede's patch from hdmi to pcm audio driver
d258f4c9663b923f16fee9f2c97da043a8c90427

Bug triggers when you try pause any playback with mplayer when
audio output selected to analog headphones:
mplayer -ao alsa:driver=hw=1.0

Signed-off-by: Alexsey Shestacov <wingrime@linux-sunxi.org>