service-wifi: remove references to getWifiStackPackageName

service-wifi is no longer an APK, thus it shares the
same package name as the rest of system_server ("android").

Bug: 176395913
Test: atest FrameworksWifiTests
Test: Tap on content of Wifi Wake notification, verify taken
      to Wifi Settings page.
Change-Id: If3d51fb55d9ce90047b5be4ac4fcf2431572d7e0
7 files changed