USB: serial: qcserial: new Sierra Wireless EM7305 device ID

A new Sierra Wireless EM7305 device ID used in a Toshiba laptop.

Reported-by: Petr Kloc <petr_kloc@yahoo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Johan Hovold <johan@kernel.org>