Move handheld-specific controllers out of base module

- Provide a way for overridable impls of *required* base components
  so we don't have to duplicate across various projects, and also use
  it to have the specialized modules provide impls dyanmically
- Use the above to replace nested optional usage for FreeformTaskListner
- Also remove unused/duplicated split controller providers from TV module

Bug: 205019015
Test: mp SystemUIGoogle
Test: mp CarSystemUI
Test: mp ArcSystemUI
Change-Id: If56b18e5814d1fa3d66f5ff04fa84ac6dd54f453
(cherry picked from commit 71b45a05)
Merged-In: If56b18e5814d1fa3d66f5ff04fa84ac6dd54f453