SystemUi: Show correct iconography for default left affordance settings.

  If the device has an active service that supports being launched
  from keyguard (voice assist), then we need to sync the settings
  iconography with the iconography being displayed in the keyguard.
  Achieve this by querying the voice interaction manager service
  via the assist utils.

Change-Id: I0b2081579ec8613a9d2f455838e289808d2bb3e8
TICKET: CRACKLING-1013