staging r8712u: Remove useless netdev_info slowly polluting dmesg

Remove useless netdev_info slowly flooding dmesg.
Fixes bug https://bugzilla.kernel.org/show_bug.cgi?id=64231



Signed-off-by: Alexandre Demers <alexandre.f.demers@gmail.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>