Staging: rtl8187se: Fix C99 style commenting in dot11d.h

This patch fixes the checkpatch.pl error "do not use C99 // comments"
in ieee80211/dot11d.n.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>