staging: wlan-ng: fix block comments style in p80211conv.h

This patch fixes the following checkpatch.pl warning in p80211conv.h:
Block comments should align the * on each line

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>