HID: multitouch: optimize the sticky fingers timer

Instead of unconditionally expiring the timer and calling a long
mt_release_contacts(), we can check if some slots are used when the
timer expires.

We can also remove the timer if we happen to receive all the releases.

The logic behind the MT_IO_FLAGS_PENDING_SLOTS could be implemented by
counting how many slots are active, but using bits feels slightly more
efficient.

Signed-off-by: Benjamin Tissoires <[email protected]>
Tested-by: Arek Burdach <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

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