Add trackpad system gesture settings API constants

Mock: https://docs.google.com/presentation/d/1dWqDciCOcF1bhzlWg6XD3yqQe6jFz7ZUDSAX7qL7l6g/edit#slide=id.g197cb24ddbc_0_42

Bug: 262189792
Test: N/A
Change-Id: I677e15ec42379871c650c9c0b5ec703a90e1b61f
4 files changed