Staging: rtl8188eu: Fix warning of printk should include KERN_.

This patch fixes the warning produced by checkpatch of "printk should
include KERN_ facility level". printk was replaced by netdev_info. While
at it, I have also fixed the line over 80 characters warning.

Signed-off-by: Elena Oat <oat.elena@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>