TIF: add TvInputManager methods to notify apps

Adds TvInputManager methods to notify apps with protected broadcasts
for:
1. Disabling browsable state of preview and watch next programs.
2. Adding preview programs to watch next programs.

Test: build and verify manually to check if notifications are
      broadcasted.
Bug: 35881266

Change-Id: I20fd5b63f42b2c74277315bbbd251b71c649e5c1