Staging: rtl8192u: Fix comments

This patch fixes comments to fit kernel coding style rules,
and also removes commented header file linux/wireless.h. Issue
found by checkpatch.pl.

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>