Revert "Remove unused lines in SEPManager"

This reverts commit 8bb27e06de444d7a11785b741b6cee6308d15a5a.
Revert "Point SEPManager start/stop methods to SEP thread in framework App SEP"

This reverts commit 3f6af9db92ba1c56f6980308e99985cbb734e046.
Revert "Move SEP code from framework IME to framework App"

This reverts commit d89f4c96bf8ea8fdddc3e4d4e3755893dd0c8188.
Moved SEP code from IME to its own class
Implement binder on framework SEP