[WifiNl80211] Rename WifiNl80211Manager namespace

Finish the renaming process from wificond -> nl80211.

Bug: 149105833
Test: atest android.net.wifi
Test: atest com.android.server.wifi
Test: system/connectivity/wificond/runtest.sh
Change-Id: Ia430e0c669758c46fca407723db30e076a018729
64 files changed