(touch-mode-md 1/n) Initialize per display touch mode (base)

Use `config_perDisplayFocusEnabled` to determine
perDisplayTouchModeEnabled. If true, then touch mode will be set per
display (otherwill touch mode switch will be global).

This CL also introduces the displayId parameter when switching touch mode
(implementation to follow in the next incoming CLs).

Bug: 198499018
Test: atest FrameworksCoreTests WindowManagerServiceTests FrameworksServicesTests
Test: atest TouchModeTest
Change-Id: I1ed9bbd8e73a67d4771e2c5d8a9bccfba85240fd