staging: r8712u: Merging Realtek's latest (v2.6.6). Copyright banners.

Only copyright banners have been added to these files. No functional changes.

Signed-off-by: Ali Bahar <ali@internetDog.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>