Touchrev Fusion: Add ABS_X/Y flags to input device registration

Without this, xf86-input-evdev complains about this touch driver.

See this bit of code for details:
	http://cgit.freedesktop.org/xorg/driver/xf86-input-evdev/tree/src/evdev.c#n1318

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>