Revert "Nullability Annotations replacement"

This reverts commit cf0501e4d7.

Reason for revert: b/317462033, it seems a flaky but revert it first.

Change-Id: Ie1d5e279cca6477fc17d8c27c1ecda8d7a6b2553

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

@@ -15,6 +15,7 @@
  */
 package com.android.settings.wifi;
 
+import android.annotation.Nullable;
 import android.app.settings.SettingsEnums;
 import android.content.ComponentName;
 import android.content.Context;
@@ -27,7 +28,6 @@ import android.util.Log;
 import android.view.View;
 import android.widget.TextView;
 
-import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.Preference;
 

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

@@ -17,6 +17,7 @@ package com.android.settings.wifi;
 
 import static com.android.settingslib.wifi.WifiUtils.getHotspotIconResource;
 
+import android.annotation.Nullable;
 import android.content.Context;
 import android.content.res.Resources;
 import android.content.res.TypedArray;
@@ -30,7 +31,6 @@ import android.widget.TextView;
 
 import androidx.annotation.DrawableRes;
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.PreferenceViewHolder;
 

src/com/android/settings/wifi/dpp/WifiDppQrCodeGeneratorFragment.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.wifi.dpp;
 
+import android.annotation.Nullable;
 import android.app.settings.SettingsEnums;
 import android.content.ComponentName;
 import android.content.Intent;
@@ -39,8 +40,6 @@ import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import androidx.annotation.Nullable;
-
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.app.chooser.DisplayResolveInfo;
 import com.android.internal.app.chooser.TargetInfo;

src/com/android/settings/wifi/factory/WifiFeatureProvider.java

@@ -16,13 +16,13 @@
 
 package com.android.settings.wifi.factory;
 
+import android.annotation.Nullable;
 import android.content.Context;
 import android.net.TetheringManager;
 import android.net.wifi.WifiManager;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelStoreOwner;
 

src/com/android/settings/wifi/factory/WifiVerboseLogging.java

@@ -16,12 +16,12 @@
 
 package com.android.settings.wifi.factory;
 
+import android.annotation.Nullable;
 import android.content.Context;
 import android.net.wifi.WifiManager;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 
 /**
  * Wi-Fi Verbose Logging

src/com/android/settings/wifi/tether/WifiTetherPreferenceController.java

@@ -21,13 +21,13 @@ import static android.net.wifi.WifiManager.SAP_START_FAILURE_GENERAL;
 
 import static com.android.settings.wifi.WifiUtils.canShowWifiHotspot;
 
+import android.annotation.NonNull;
 import android.content.Context;
 import android.net.wifi.SoftApConfiguration;
 import android.net.wifi.WifiClient;
 import android.net.wifi.WifiManager;
 import android.text.BidiFormatter;
 
-import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.PreferenceScreen;
 

src/com/android/settings/wifi/tether/WifiTetherSecurityPreferenceController.java

@@ -16,13 +16,13 @@
 
 package com.android.settings.wifi.tether;
 
+import android.annotation.NonNull;
 import android.content.Context;
 import android.net.wifi.SoftApCapability;
 import android.net.wifi.SoftApConfiguration;
 import android.net.wifi.WifiManager;
 import android.util.Log;
 
-import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;