Add Quectel UC15, UC20, EC21, and EC25.  The EC20 is handled by
qcserial due to a USB VID/PID conflict with an existing Acer
device.
Signed-off-by: NDan Williams <dcbw@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NJohan Hovold <johan@kernel.org>