Add @UnsupportedAppUsage annotations

For packages:
  android.renderscript

This is an automatically generated CL. See go/UnsupportedAppUsage
for more details.

Exempted-From-Owner-Approval: Mechanical changes to the codebase
which have been approved by Android API council and announced on
android-eng@

Bug: 110868826
Test: m
Change-Id: I016f6e720e79c48afe44f4690b5dd99fc81ae780
Merged-In: I1aa8ebca448547031b426a7b305c5c3d6fcf2652

rs/java/android/renderscript/Element.java

@@ -16,6 +16,8 @@
 
 package android.renderscript;
 
+import android.annotation.UnsupportedAppUsage;
+
 /**
  * <p>An Element represents one item within an {@link
  * android.renderscript.Allocation}.  An Element is roughly equivalent to a C
@@ -1146,6 +1148,7 @@ public class Element extends BaseObj {
      * @param dt The DataType for the new element.
      * @return Element
      */
+    @UnsupportedAppUsage
     static Element createUser(RenderScript rs, DataType dt) {
         DataKind dk = DataKind.USER;
         boolean norm = false;