CI: Allow running tests on sjg lab

CI: Allow running tests on sjg lab

Add a way to run tests on a real hardware lab. This is in the very early
experimental stages. There are only 23 boards and 3 of those are broken!
(bob, ff3399, samus). A fourth fails due to problems with the TPM tests.

To try this, assuming you have gitlab access, set SJG_LAB=1, e.g.:

   git push -o ci.variable="SJG_LAB=1" dm HEAD:try

This relies on the two previous series targeted at -next as well as the
bugfix series for -master

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>