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This introduces a new test for audio going through display connectors.
It currently contains a single subtest for HDMI signal integrity, but
other test cases will be added later on.
The test setup consists in using an HDMI-VGA bridge that separates the
audio out (via a 3.5 mm jack) and feeding this back to the DUT's line-in
where it can be recorded by ALSA with controls correctly configured.
The audio test makes use of the audio and ALSA igt libraries helpers.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
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