MotionEvent: Guard getRawX/Y compatibility logic using feature flag

The getRawX/Y API contains compatibility logic that should only be used
when the per-window-input-rotation feature is enabled.

The compatibility logic was previously unguarded because it was assumed
that the logic was a no-op when the flag was not enabled. However, this
turned out to be untrue, resulting in the bug.

Bug: 187686656
Test: manual: using repro steps listed in the bug.
Change-Id: I6603694f9872e7df4b6f72c7fb2555b3249687a6