Don't report focusableViewAvailable on add

This reverts a part of 2ae1bf568b68ea18431ab10aceeff3ec62aedb7b

RecyclerView relies on the old behavior. Will un-revert this (with
targetSdk check) once we have a solution for RecyclerView

Bug: 38352147
Test: RecyclerView Focus tests now pass
Change-Id: I7b0dfda295cd75e407bbd39a948b5585f8ed6e08
diff --git a/core/java/android/view/ViewGroup.java b/core/java/android/view/ViewGroup.java
index 8637593..4b79b8c 100644
--- a/core/java/android/view/ViewGroup.java
+++ b/core/java/android/view/ViewGroup.java
@@ -4936,9 +4936,6 @@
                 needGlobalAttributesUpdate(true);
             }
             ai.mKeepScreenOn = lastKeepOn;
-            if (!childHasFocus && child.hasFocusable()) {
-                focusableViewAvailable(child);
-            }
         }
 
         if (child.isLayoutDirectionInherited()) {