Input: wacom - add support for three new Intuos devices

This series of models added a hardware switch to turn touch
data on/off. To report the state of the switch, SW_TOUCH_ENABLED
is added in include/uapi/linux/input.h.

The driver is also updated to process wireless devices that do
not support touch interface.

Signed-off-by: Ping Cheng <pingc@wacom.com>