Input: wacom - add another Bamboo Pen ID (0xd4)

Add the features struct and device table entry to enable yet another
version of Wacom Bamboo Pen (CTL460, Product ID 0xD4).

Signed-off-by: Kevin Granade <kevin.granade@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>