Removed close guards for Element and Type objects

Bug: 28053769

These objects are tiny and unlikely to cause memory issues.

In addition, llvm-rs-cc auto-generated code contains such objects, which are
not visibible to developers and impossible to manually destroy, leaving
distracting warnings in Strict Mode.

Test: RsTest with StrictMode on and CTS tests

Change-Id: Iec68cca4f1259124b9f503a230c1a28b97ede1f3

rs/java/android/renderscript/Element.java

@@ -1071,7 +1071,6 @@ public class Element extends BaseObj {
             mSize += mElements[ct].mSize * mArraySizes[ct];
         }
         updateVisibleSubElements();
-        guard.open("destroy");
     }
 
     Element(long id, RenderScript rs, DataType dt, DataKind dk, boolean norm, int size) {
@@ -1091,7 +1090,6 @@ public class Element extends BaseObj {
         mKind = dk;
         mNormalized = norm;
         mVectorSize = size;
-        guard.open("destroy");
     }
 
     Element(long id, RenderScript rs) {

rs/java/android/renderscript/Type.java

@@ -227,7 +227,6 @@ public class Type extends BaseObj {
 
     Type(long id, RenderScript rs) {
         super(id, rs);
-        guard.open("destroy");
     }
 
     @Override