Revert "Enable new initial-focus behavior for P"

This reverts commit 4dc3289c94.

Reason for revert: Pushback from bundled apps.

Bug: 68841055
Bug: 34520588
Change-Id: Id771a11c9b44baf5810240cca164bae9f468b5ad

core/java/android/view/ViewRootImpl.java

@@ -512,7 +512,7 @@ public final class ViewRootImpl implements ViewParent,
         mDisplayManager = (DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);
 
         if (!sCompatibilityDone) {
-            sAlwaysAssignFocus = mTargetSdkVersion < Build.VERSION_CODES.P;
+            sAlwaysAssignFocus = true;
 
             sCompatibilityDone = true;
         }