Summarize information about connected analog pins and EDID-like data received

from HDMI/DisplayPort devices in form of general connection status and
sound(4)-style channel matrix.  Now that information is only reported in
readable form to verbose logs, but potentially could be used by sound(4)
to correctly choose default devices and configure vchans.

Fix rear and side channels swap on analog 7.1 outputs.  As soon as there is
a huge mess in industry about naming and using of these channels, duplicate
rear channels of 4 and 5.1 streams to both read and side speakers.

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