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/TouchBlockingFrameLayout.java

@@ -16,12 +16,13 @@
 
 package com.android.settings;
 
-import android.annotation.Nullable;
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.widget.FrameLayout;
 
+import androidx.annotation.Nullable;
+
 /**
  * Extension of FrameLayout that consumes all touch events.
  */