MotionEvent: Get offsets in raw coordinate space

Use the offsets in raw coordinates instead of the previously used
offsets in untransformed coordinates, which does not have any meaning in
Java.

Bug: 249340921
Test: atest libinput_tests
Test: atest inputflinger_tests
Change-Id: Ia21d63be5a2c45a2339227061de89ab772a8e7f7