Use aidl definitions for MotionEvent flag values

This will ensure that there is a single source of truth for MotionEvent
flags, and will help developers that add new flags understand that the
constants need to be added in multiple places, instead of just in java.

Bug: 309829647
Test: m sync
Change-Id: I7dadde669ba936d44c284c2698c18a71548dc101
2 files changed