MotionEvent: Consolidate functions to transform PointerCoords

Remove PointerCoords::transform(), which is a duplicate of
MotionEvent::calculateTranformedCoords().

Bug: 342349872
Test: atest inputflinger_tests libinput_tests
Change-Id: I7610a0475a16e9964817f63efa67b291cb7aaf0a
3 files changed