Revert^2 "Nullability Annotations replacement"

This reverts commit 19d1d3d15d.

Reason for revert: revert it because this is not the root cause.

bug: 316867690
Change-Id: I0f168dbb64044aa720202af7b1040afd4f028c9c

src/com/android/settings/bluetooth/LocalBluetoothPreferences.java

@@ -16,7 +16,6 @@
 
 package com.android.settings.bluetooth;
 
-import android.annotation.Nullable;
 import android.app.ActivityManager;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
@@ -26,6 +25,8 @@ import android.content.res.Configuration;
 import android.text.TextUtils;
 import android.util.Log;
 
+import androidx.annotation.Nullable;
+
 import com.android.settingslib.bluetooth.LocalBluetoothManager;
 
 /**