[Settings] Code refactor - remove unused import lines

Remove some unused import lines within source code based on
https://source.android.com/setup/contribute/code-style

Bug: 182867979
Test: build pass
Change-Id: I76dbcfa9e5b435b2838401dfee15b12f472d07d0

src/com/android/settings/deviceinfo/MigrateEstimateTask.java

@@ -29,9 +29,9 @@ import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
-import android.util.Log;
 import android.text.format.DateUtils;
 import android.text.format.Formatter;
+import android.util.Log;
 
 import java.io.IOException;
 import java.util.UUID;