HID: wacom: Add WACOM_DEVICETYPE_DIRECT for Cintiqs and similar

HID: wacom: Add WACOM_DEVICETYPE_DIRECT for Cintiqs and similar

"Direct" input devices like Cintiqs and Tablet PCs set the INPUT_PROP_DIRECT
property to notify userspace that the sensor and screen are overlaid. This
information can also be useful elsewhere within the kernel driver, however,
so we introduce a new WACOM_DEVICETYPE_DIRECT that signals this to other
kernel code.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>