driver core: Add missing '\n' in log messages

Message logged by 'dev_xxx()' or 'pr_xxx()' should end with a '\n'.

While at it, convert some "printk(KERN_" into equivalent but less verbose
(pr|dev)_xxx functions.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20200411133158.27390-1-christophe.jaillet@wanadoo.fr


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>