Input: xpad - add GPD Win 2 Controller USB IDs

GPD Win 2 Website: http://www.gpd.hk/gpdwin2.asp



Tested on a unit from the first production run sent to Indiegogo backers

Signed-off-by: Ethan Lee <flibitijibibo@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>