Input: psmouse - add newline to OLPC HGPK touchpad debugging

When probing for the OLPC HGPK touchpad the ID of the probed touchpad is
emitted, but the debug is missing the terminating newline.  This causes
later information to run into it, and for that to be categorised
incorrectly at KERN_DBG.  Fix this up.

Reported-by: Matt Zimmerman <mdz@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>