Volcano Inferno MTK 1.5.0

Fixed: MetaMode detect port failed issue.
Fixed: MTK6570 updata Imei in MetaMode failed issue.
Added: Exit Meta Mode after update Imei finished.
Fixed: Connect failed after write flashID with mt6572.https://drive.google.com/drive/folders/0B1-RQDhpiqbDb1BZMUgxemtqTXM