usb: option: add SIMCom SIM5218

Tested with SIM5218EVB-KIT evaluation kit.

Signed-off-by: Veli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>