[NAN] Initialization changes to make sure that callbacks are registered.

- On disable: execute commands before uninitializing the NAN (not good
  enough since can't force command order execution in queue)
- On enable: set HAL init flag to false to force re-registration (not
  high cost)

Bug: 29105100
Change-Id: Iea6748aea2f73d26e2d63c17e6442e884ebc273f
2 files changed
tree: f628090fe0abf706eb0f3e09e238cf26642425bc
  1. service/
  2. tests/