driver: add support for Guermok HDMI to USB 3.0 capture dongle

[a3f]

Description

This low-cost1 capture dongle supports MJPEG (and YUYV) and supports
up to 3840x2160@18 on USB 3.0 speeds.
When connected over USB 2.0, the highest supported mode is 1920x1080@50
as reported by v4l2-ctl2.

Choose MJPEG to conserve USB bandwidth and add 1920x1080 as default
mode.

• what do you use the feature for?

See HDMI output of DUT

• how does labgrid benefit as a testing library from the feature?

We already support a number of Webcams. Low cost HDMI grabbers and pixel perfect capture could allow better automated testing

• how did you verify the feature works?

Installed manually and tested it out both over USB 3.0 and USB 2.0

• if hardware is needed for the feature, which hardware is supported and which
  hardware did you test with?

https://www.amazon.de/dp/B08Z3XDYQ7

Checklist

• PR has been tested

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.6%. Comparing base (881de63) to head (9b7c859).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/driver/usbvideodriver.py	0.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1709     +/-   ##
========================================
- Coverage    55.6%   55.6%   -0.1%     
========================================
  Files         172     172             
  Lines       13467   13469      +2     
========================================
  Hits         7495    7495             
- Misses       5972    5974      +2     

Flag	Coverage Δ
3.10	55.6% <0.0%> (-0.1%)	⬇️
3.11	55.6% <0.0%> (-0.1%)	⬇️
3.12	55.6% <0.0%> (-0.1%)	⬇️
3.13	55.6% <0.0%> (-0.1%)	⬇️
3.9	55.6% <0.0%> (-0.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.