[AE] - extend the number of unknown channels from 8 to 16
[AE/CA/osx] - fillup the stream with up to 16 unknown channels fixes
support for studio audio devices with more then 8 unused/unknown channels
in one stream
[AE/CA/osx] - cosmetics - make comment generic
Merge pull request #5935 from Memphiz/osxallowsixteenunknownchannels

[osx] - fix broken audio devices with more then 8 unknown channels in one stream