Mir

Comment 1 for bug 1564830

I suspect udevd detects the device properly so any libinput version before 1.2 will ignore the device.
To get tablet support we have to:
* update to 1.2
* support LIBINPUT_DEVICE _CAP_TABLET_TOOL and handle LBINPUT_EVENT_TABLET_TOOL_{PROXIMITY,TIP,BUTTON} in libinput_device.cpp
* add proper event types to MirInputEvent and add respective client apis for that.