Prevent unwanted keypress actions during TV Setup.

    - Prevent Search or long-press Home actions
      while TV setup is being completed based
      on flag TV_USER_SETUP_COMPLETE.

Test: Manual - Reset device, ran Setup, tried keys.
Test: Manual - Rebooted device after Setup, tried keys.

Bug: 62419382
Change-Id: Ic8fb0f10943ab7c39a7d9857f62e6ab292231b40
(cherry picked from commit 0390fff8)