s5k3l6xx: avoid printing debug messages to the error logs

Improve the default log output a bit.
2 jobs for pureos/byzantium in 63 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #338099
librem5
build:aarch64

00:36:55

passed #338100
librem5:arm64
build:deb

01:03:30