Revert "[Wi-Fi] Apply WifiTrackerLib objects in Wi-Fi Slice"

This reverts commit 7b1aded2a6.

Reason for revert: Settings is crashing for WiFi selection in SetupWizard on wembley

Bug: 161434533
Change-Id: I1d90e9bae1b31862fba674db0d7497e43f987a7f
Test: Locally reverted, reflashed, and was able to select WiFi without Settings crashing.
Exempt-From-Owner-Approval: Revert to clear up P0 while all owners are outside of work hours

src/com/android/settings/wifi/AddNetworkFragment.java

@@ -32,7 +32,6 @@ import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.R;
 import com.android.settings.core.InstrumentedFragment;
-import com.android.settings.wifi.dpp.WifiDppQrCodeScannerFragment;
 import com.android.settings.wifi.dpp.WifiDppUtils;
 
 /**
@@ -117,7 +116,7 @@ public class AddNetworkFragment extends InstrumentedFragment implements WifiConf
             }
 
             final WifiConfiguration config = data.getParcelableExtra(
-                    WifiDppQrCodeScannerFragment.KEY_WIFI_CONFIGURATION);
+                    WifiDialogActivity.KEY_WIFI_CONFIGURATION);
             successfullyFinish(config);
         }
     }