Move auto-fill shell command off IPC

Auto-fill has a shell command that is useful for development
which is currently exposed as a remote method allowing any app
to call it reflectively. Since only case this method is called
is when handling a shell command there is no need to expose it
to IPC over binder.

Test: manual

Change-Id: Iac20b4a39c7065e254f8aa277d1f2fd1c38b24a8