Run-tested 5.4 on Shuttle KD20 for some days now, everything seems
fine so far. Let's have snapshot builds based on 5.4.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Add 5.4 kernel version as a new testing kernel option.
Run-tested on Shuttle KD20, seems to work just as well as kernel 4.14.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>