ath9k/carl9170: advertise P2P

With some upcoming changes we'd like to use
the interface types for P2P capability tests.
Enable them now so that when we add those
tests in wpa_supplicant, nothing will break.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
index a314c2c..dc7b30b 100644
--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -1631,7 +1631,8 @@
 	 * supports these modes. The code which will add the
 	 * additional interface_modes is in fw.c.
 	 */
-	hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
+	hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
+				     BIT(NL80211_IFTYPE_P2P_CLIENT);
 
 	hw->flags |= IEEE80211_HW_RX_INCLUDES_FCS |
 		     IEEE80211_HW_REPORTS_TX_ACK_STATUS |