HID: wacom - enable LED support for Wireless Intuos5/Pro

And associate all LED/OLED to PAD device

Signed-off-by: Ping Cheng <pingc@wacom.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>