Add support for riscv64

[Vogtinator]

Some small things which make riscv64 tests a bit simpler. Especially not having a keyboard by default is rather annoying.

VR: http://10.168.4.192/tests/1436

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching backend/**.pm:

• Consider running manual verification tests, especially for non-qemu backends

This is an automatically generated QA checklist based on modified files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (86f4251) 95.12% compared to head (5038fd6) 95.12%.
Report is 77 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2420   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files         155      155           
  Lines       15404    15446   +42     
=======================================
+ Hits        14653    14693   +40     
- Misses        751      753    +2     

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