ar9170: kill duplicated HT feature flag

This patch removes a redundant flag.

.cap	=	IEEE80211_HT_CAP_MAX_AMSDU |	\
>		IEEE80211_HT_CAP_SM_PS |			\ <
		[...]									\
>		IEEE80211_HT_CAP_SM_PS,			\ <
		.ampdu_factor   = 3,					\
Signed-off-by: NChristian Lamparter <chunkeey@web.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ar9170/main.c

@@ -146,7 +146,6 @@ static struct ieee80211_channel ar9170_5ghz_chantable[] = {
 {									\
 	.ht_supported	= true,						\
 	.cap		= IEEE80211_HT_CAP_MAX_AMSDU |			\
-			  IEEE80211_HT_CAP_SM_PS |			\
 			  IEEE80211_HT_CAP_SUP_WIDTH_20_40 |		\
 			  IEEE80211_HT_CAP_SGI_40 |			\
 			  IEEE80211_HT_CAP_DSSSCCK40 |			\