Input: usbtouchscreen - ignore eGalax screens supporting HID protocol

The newer versions of the eGalax/EETI screen implement the HID protocol.
The device IDs are still the same, but the USB interface descriptor shows
the device being of HID class. Change usbtouchscreen to ignore the HID
models as they are handled properly by usbhid.

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>