[RFC] alsa-mixer: remove alsa mixer 2 channels max limit
We might have greater channel count than stereo in devices like dmic arrays (for example 4 dmics in Lenovo X1). However alsa mixer elements with more than 2 channels can't be used by pulseaudio, because of fixed size 2 array in channel mask. Remove this artificial limitation and set max channels to 8.
Signed-off-by: Jaska Uimonen jaska.uimonen@linux.intel.com