Improve tap-and-drag detection for ALPS touchpads.

The ALPS mechanism for gesture detection can produce long delays between
a packet that signals a tap and the next packet, which either signals
the end of the gesture or the start of a drag-operation. The time spans
can exceed the timeouts used by the generic detection mechanism in the
synaptics driver. Reporting both the touch and the release event when
the second packet has arrived ensures that the tap will be recognized.

ok mpi@ shadchin@

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