Fix Intuos5 and Intuos Pro touch interfaces on 2.6.30+

The touch interfaces on for these two devices have not been set
up properly and will likely be mis-detected by xf86-input-wacom
and result in a non-functional touch device. This patch ensures
the driver declares the appropriate axes for the pen and touch
interfaces, and routes touches from both through the appropriate
IRQ method.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Declare ABS_X and ABS_Y for all device types

Devices capable of >2 touches were not declaring support for the ABS_X
and ABS_Y axes despite using pointer emulation. The 3.7+ kernel already
takes care of this for us, but we need to be sure that they are declared
under 2.6.38+ (lest xf86-input-wacom ignore the device).

Signed-off-by: Jason Gerecke <killertofu@gmail.com>