HID: wacom - make sure wacom_intuos_inout only process in/out events

Move general events related data validation to wacom_intuos_general.

Signed-off-by: Ping Cheng <pingc@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>