input: touchscreen: fusion: implement multitouch with slot handling

According to multi-touch-protocol.txt the kernel knows two type of
devices:
- Type A: devices which provide anonymous contacts
- Type B: devices which are capable of tracking individual contacts

The Fusion touch screen is a Type B device: The Touch ID field allows
to differentiate between 2 different fingers. This updates the driver
to properly allocate a slot for each identified contact and use the
helper functions available from the input core system.

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