ath9k: Add hardware support for QCA9531

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 01c41c6..6d643ca 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -419,7 +419,7 @@
 		rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
 	}
 
-	if (AR_SREV_9550(sc->sc_ah))
+	if (AR_SREV_9550(sc->sc_ah) || AR_SREV_9531(sc->sc_ah))
 		rfilt |= ATH9K_RX_FILTER_4ADDRESS;
 
 	return rfilt;