Revert "iwlwifi: mvm: drop non VO frames when flushing"

This is now implemented by mac80211 (commit below).
mac80211 will flush/drop the frames on the queues before
suspending / disconnecting.
It will then send the deauth and wait until the queues are
empty.

commit 3b24f4c6
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date:   Wed Jan 7 15:42:39 2015 +0200

    mac80211: let flush() drop packets when possible

This reverts commit 4e6c48e0.

drivers/net/wireless/iwlwifi/mvm/mac80211.c

@@ -3565,16 +3565,18 @@ static void iwl_mvm_mac_flush(struct ieee80211_hw *hw,
 		msk |= mvmsta->tfd_queue_msk;
 	}
 
-	msk &= ~BIT(vif->hw_queue[IEEE80211_AC_VO]);
-
+	if (drop) {
 		if (iwl_mvm_flush_tx_path(mvm, msk, true))
 			IWL_ERR(mvm, "flush request fail\n");
 		mutex_unlock(&mvm->mutex);
+	} else {
+		mutex_unlock(&mvm->mutex);
 
 		/* this can take a while, and we may need/want other operations
 		 * to succeed while doing this, so do it without the mutex held
 		 */
 		iwl_trans_wait_tx_queue_empty(mvm->trans, msk);
+	}
 }
 
 const struct ieee80211_ops iwl_mvm_hw_ops = {