staging: vt6655: mac80211 conversion: PSbIsNextTBTTWakeUp convert to mac80211

Wake up to listen to next beacon when struct ieee80211_conf -> listen_interval == 1

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>