Revert "ci: Remove T820 from CI temporarily"

This reverts commit 089c8f0b.

Our office changes are finished and power is now stable in our lab for T820 CI to run again.

In the meantime, the lava tags handling broke, the first commit fixes this.

Cc: Daniel Stone Cc: Tomeu Vizoso Signed-off-by: Neil Armstrong

Edited by Neil Armstrong

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