carl9170: enable IEEE80211_HW_NEED_DTIM_PERIOD

Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/main.c

@@ -1577,6 +1577,7 @@ void *carl9170_alloc(size_t priv_size)
 		     IEEE80211_HW_REPORTS_TX_ACK_STATUS |
 		     IEEE80211_HW_SUPPORTS_PS |
 		     IEEE80211_HW_PS_NULLFUNC_STACK |
+		     IEEE80211_HW_NEED_DTIM_PERIOD |
 		     IEEE80211_HW_SIGNAL_DBM;
 
 	if (!modparam_noht) {