USB: serial: qcserial: add new usb-id for Dell branded EM7455

Add support for Dell 5811e (EM7455) with USB-id 0x413c:0x81c2.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>