[NAN] Add master switch to enable/disable usage of NAN APIs.

Add master switch to enable/disable usage of NAN. Tie into Wi-Fi
state machine (to enable/disable based on Wi-Fi enable/disable).
Dispatch broadcasts when NAN status changes.

Bug: 27698011
Bug: 27692829
Change-Id: Ic4789ba7afd280ebcaa6d6bfdc5917ef0875983b
10 files changed
tree: 2900c28356006670c2c4baf632806537429cf18b
  1. service/
  2. tests/