Bluetooth: MGMT: Fix marking SCAN_RSP as not connectable

When receiving a scan response there is no way to know if the remote
device is connectable or not, so when it cannot be merged don't
make any assumption and instead just mark it with a new flag defined as
MGMT_DEV_FOUND_SCAN_RSP so userspace can tell it is a standalone
SCAN_RSP.

Link: https://lore.kernel.org/linux-bluetooth/CABBYNZ+CYMsDSPTxBn09Js3BcdC-x7vZFfyLJ3ppZGGwJKmUTw@mail.gmail.com/
Fixes: c70a7e4c ("Bluetooth: Add support for Not Connectable flag for Device Found events")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/bluetooth/mgmt.h

@@ -979,6 +979,7 @@ struct mgmt_ev_auth_failed {
 #define MGMT_DEV_FOUND_NOT_CONNECTABLE		BIT(2)
 #define MGMT_DEV_FOUND_INITIATED_CONN		BIT(3)
 #define MGMT_DEV_FOUND_NAME_REQUEST_FAILED	BIT(4)
+#define MGMT_DEV_FOUND_SCAN_RSP			BIT(5)
 
 #define MGMT_EV_DEVICE_FOUND		0x0012
 struct mgmt_ev_device_found {

net/bluetooth/hci_event.c

@@ -6317,23 +6317,18 @@ static void process_adv_report(struct hci_dev *hdev, u8 type, bdaddr_t *bdaddr,
 		return;
 	}
 
-	/* When receiving non-connectable or scannable undirected
-	 * advertising reports, this means that the remote device is
-	 * not connectable and then clearly indicate this in the
-	 * device found event.
-	 *
-	 * When receiving a scan response, then there is no way to
+	/* When receiving a scan response, then there is no way to
 	 * know if the remote device is connectable or not. However
 	 * since scan responses are merged with a previously seen
 	 * advertising report, the flags field from that report
 	 * will be used.
 	 *
-	 * In the really unlikely case that a controller get confused
-	 * and just sends a scan response event, then it is marked as
-	 * not connectable as well.
+	 * In the unlikely case that a controller just sends a scan
+	 * response event that doesn't match the pending report, then
+	 * it is marked as a standalone SCAN_RSP.
 	 */
 	if (type == LE_ADV_SCAN_RSP)
-		flags = MGMT_DEV_FOUND_NOT_CONNECTABLE;
+		flags = MGMT_DEV_FOUND_SCAN_RSP;
 
 	/* If there's nothing pending either store the data from this
 	 * event or send an immediate device found event if the data