p54: enable power save support

This patch enables power save support on all p54 devices.
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/p54common.c

@@ -2548,6 +2548,8 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 	priv->basic_rate_mask = 0x15f;
 	skb_queue_head_init(&priv->tx_queue);
 	dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
+		     IEEE80211_HW_SUPPORTS_PS |
+		     IEEE80211_HW_PS_NULLFUNC_STACK |
 		     IEEE80211_HW_SIGNAL_DBM |
 		     IEEE80211_HW_NOISE_DBM;