Controls UI - Wait for callback to potentially show controls

A race condition exists when global actions is shown. The controls
listing callback may not yet have been reached when the dialog is
shown. If this happens, add controls into the space.

Fixes: 156624057
Test: restart and immediately invoke power menu
Change-Id: Ic3d70a7a4e65d9d01004ccb36133e992aadc73c7