staging: vt6655: iwctl.c: Comments fixes

Replace C99 "//" comments by "/* */", remove comments about
adding code, remove commented code (one left there for
debugging of the function)
Signed-off-by: Veronika Kabatova <veronicca114@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>