port-evbarm/50812: clicking sound during playback with Banana Pi onboard audio

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>Number:         50812
>Category:       port-evbarm
>Synopsis:       clicking sound during playback with Banana Pi onboard audio
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 15 23:25:00 +0000 2016
>Originator:     Dan MacDonald
>Release:        7.0
>Organization:
>Environment:
NetBSD armv7 7.0_STABLE NetBSD 7.0_STABLE (BPI)
>Description:
I have tried playing FLAC, WAV/AIFF and OGG files under both moc and mpv under NetBSD 7.0 on the Banana Pi and in all cases there is a regular, clearly audible clicking sound - approx 2/3 clicks per second - distorting the audio.

The clicking only occurs when sound is being output and the noise increases/decreases proportionately with the volume of the audio being output.
>How-To-Repeat:
Play any audio file under NetBSD 7.0 on the BPi
>Fix: