Refactor android_view_MotionEvent_obtainAsCopyFromNative implementation

Remove custom copying logic from
android_view_MotionEvent_obtainAsCopyFromNative and refactor it to use
existing android_view_MotionEvent_obtainFromNative to reduce
duplicate divergent logic.

Bug: 324375527
Test: atest MotionEventTest
Change-Id: Ib7c6533fb6e0a0203e68a109d1b912082dafc239