HID: hid-multitouch - add another eGalax id

This allows ASUS Eee Slate touchscreens to work.

Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>