Initialize PointerCoords in input tests

The struct PointerCoords in VelocityTracker_test is created on the
stack, but never initialized. Later, the coords are used to add an x and
y value to the MotionEvent.

The field "bits" in the struct is therefore initialized to whatever was
previously occupying that stack address.
It is possible that stack contained some non-zero data. This would cause
enough of the bits of the 'bits' variable to be set, but without any of
them being X or Y. As a result, when a new X or Y value is assigned, it
does not fit into the bits (there's a 30-axes limit), and therefore
remains at zero.

Later, when velocity is computed, the coordinates evaluate to zero, and
therefore, zero velocity is produced. The test fails, because a non-zero
velocity is expected.

After an audit of the entire Android codebase for usage of
PointerCoords, found another potential issue in InputClassifier_test.
Likely the code was copied over from VelocityTracker_test. Add a fix for
that as well.

Bug: 126536349
Test: atest -it -a libinput_tests, but only executed after building and
flashing asanified libinput and libinput_tests onto device.

Change-Id: Id8b870b6201d7489284bf9fc646750770bb9321a

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