wifi: Add SoftAp Max Client control support

1. Max Client control
2. Listen carrier config changed and update softap capability
3. Trigger forceClientDisconnect when reach client
4. check HIDL version to handle old hidl case.

Bug: 142752869
Test: atest frameworks/opt/net/wifi/tests/wifitests/
Change-Id: Ibdd49578dbd454891a55100707863f7e209d0903
13 files changed
tree: f91b05910d8a05ebd5274a8fa8d67bfe79133409
  1. apex/
  2. service/
  3. PREUPLOAD.cfg