[PATCH] USB: ftdi_sio: add support for Yost Engineering ServoCenter3.1

This patch adds support for Yost Engineering Inc's ServoCenter 3.1 USB
product to the ftdi_sio driver's device ID table.  The PID was supplied
by Aaron Prose of Yost Engineering on the ftdi-usb-sio-devel list.  The
PID 0xE050 matches the Windows INF files for this device.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>