nl80211: disable_11b_rates on interface mode change

disable_11b_rates() is called on interface addition,
but not on interface type change, resulting in 11b rates
enabled on p2p interfaces.

Signed-off-by: Eliad Peller <eliad@wizery.com>

src/drivers/driver_nl80211.c

@@ -5770,6 +5770,9 @@ done:
 		bss->beacon_set = 0;
 	}
 
+	if (!ret && drv->disable_11b_rates)
+		nl80211_disable_11b_rates(drv, drv->ifindex, 1);
+
 	if (ret)
 		wpa_printf(MSG_DEBUG, "nl80211: Interface mode change to %d "
 			   "from %d failed", nlmode, drv->nlmode);