Bluetooth: Fix HCI init for BlueFRITZ! devices

None of the BlueFRITZ! devices with manufacurer ID 31 (AVM Berlin)
support HCI_Read_Local_Supported_Commands. It is safe to use the
manufacturer ID (instead of e.g. a USB ID specific quirk) because the
company never created any newer controllers.

< HCI Command: Read Local Supported Comm.. (0x04|0x0002) plen 0 [hci0] 0.210014
> HCI Event: Command Status (0x0f) plen 4 [hci0] 0.217361
      Read Local Supported Commands (0x04|0x0002) ncmd 1
        Status: Unknown HCI Command (0x01)
Reported-by: NJörg Esser <jackfritt@boh.de>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Tested-by: NJörg Esser <jackfritt@boh.de>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/hci_core.c

@@ -513,7 +513,10 @@ static void hci_init2_req(struct hci_request *req, unsigned long opt)
 
 	hci_setup_event_mask(req);
 
-	if (hdev->hci_ver > BLUETOOTH_VER_1_1)
+	/* AVM Berlin (31), aka "BlueFRITZ!", doesn't support the read
+	 * local supported commands HCI command.
+	 */
+	if (hdev->manufacturer != 31 && hdev->hci_ver > BLUETOOTH_VER_1_1)
 		hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);
 
 	if (lmp_ssp_capable(hdev)) {