qcacld-3.0: Fix P2P GO vdev start failure

qcacld-2.0 to qcacld-3.0 propagation

In case of P2P device and P2P GO using seperated
interface, if P2P Device interface listen (remain on
channel) with long duration is active, P2P GO interface
vdev start command will be timeout.
In shared interface case, driver will cancel existing
P2P listen during interface type changing from P2P device
to P2P GO in __wlan_hdd_cfg80211_change_iface. There
is no such issue.
This fix is to extend the canceling logic just before P2P GO
starting to avoid the vdev start timeout in first case.

Change-Id: I5c5903bc5eded417ede670025c241daf73b96700
CRs-Fixed: 1022238
(cherry picked from commit 696a5a4e110482bcf873b6c657fe621aa2dd8b8e)

core/hdd/src/wlan_hdd_hostapd.c

@@ -7896,6 +7896,16 @@ static int __wlan_hdd_cfg80211_start_ap(struct wiphy *wiphy,
 			return -EINVAL;
 		}
 	}
+	if (pAdapter->device_mode == QDF_P2P_GO_MODE) {
+		hdd_adapter_t  *p2p_adapter;
+		p2p_adapter = hdd_get_adapter(pHddCtx, QDF_P2P_DEVICE_MODE);
+		if (p2p_adapter) {
+			hdd_info("cancel active p2p device ROC before GO "
+				"starting");
+			wlan_hdd_cancel_existing_remain_on_channel(
+				p2p_adapter);
+		}
+	}
 
 	if ((pAdapter->device_mode == QDF_SAP_MODE)
 	    || (pAdapter->device_mode == QDF_P2P_GO_MODE)