[ci/style] activate stylecheck on unit tests

Quite a few changes needed.
5 jobs for more-checkpatch in 16 minutes and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #45436
integration
checkpatch

00:00:48

passed #45435
integration
repoquality

00:10:42

 
  Build
passed #45437
make:generic

00:01:34

passed #45439
knl
make:knl

00:02:27

passed #45438
make:out-of-tree

00:01:33