mac80211: add a flag to indicate CCK support for HT clients

brcm80211 cannot handle sending frames with CCK rates as part of an
A-MPDU session. Other drivers may have issues too. Set the flag in all
drivers that have been tested with CCK rates.

This fixes a reported brcmsmac regression introduced in
commit ef47a5e4f1aaf1d0e2e6875e34b2c9595897bef6
"mac80211/minstrel_ht: fix cck rate sampling"

Cc: stable@vger.kernel.org # 3.10
Reported-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
index 4a33c6e..349fa22 100644
--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -1860,7 +1860,8 @@
 		     IEEE80211_HW_PS_NULLFUNC_STACK |
 		     IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC |
 		     IEEE80211_HW_SUPPORTS_RC_TABLE |
-		     IEEE80211_HW_SIGNAL_DBM;
+		     IEEE80211_HW_SIGNAL_DBM |
+		     IEEE80211_HW_SUPPORTS_HT_CCK_RATES;
 
 	if (!modparam_noht) {
 		/*