[ae/ca] - add support for fetching the stereo channel layout of a device
[ae/osxsink] - fetch multichannel or stereo channel map from ca and use this to remap channels - fixes wrong lpcm channel mapping
[AE/osxsink] - allow mapping of more then CA_MAX_CHANNELS if a channel map
was fetched - takes care of #15261
Merge pull request #4719 from Memphiz/osxsink_channelmap

[AE/osxsink] - fix multichannel speaker layout / channel mapping