s5k3l6xx: fix debug prints

Fix output in success cases to be printed as dbug info
2 jobs for 20211108_s5k_fixes in 69 minutes and 35 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build:aarch64 #375988
librem5

00:27:23

passed build:deb #375989
librem5:arm64

01:09:34