wificond: transfer implementation to android.net.wifi

Move implementation of wificond to frameworks/base (android.net.wifi)
in prepration for making into a public API (which will be a wrapper
around the AIDL).

Bug: 140062898
Test: ./system/connectivity/wificond/runtests.sh
Test: associates, soft AP client information received correctly
Change-Id: I22f2e926f0320af9bda758b764d99b8d4a350674
47 files changed