Let's use dev_dbg() instead of dev_info() to minimize verbosity in case
we're not interested in low-level details.

While here, replace dev_info() with dev_err() in places where errors are
reported.

Reported-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>