JNI/JCE: fix Javadoc warnings about default constructors in WolfCryptUtil and Asn

Author: cconlon

src/main/java/com/wolfssl/provider/jce/WolfCryptUtil.java

@@ -54,6 +54,10 @@
  */
 public class WolfCryptUtil {
 
+    /** Default WolfCryptUtil constructor. */
+    public WolfCryptUtil() {
+    }
+
     /**
      * Maximum size of the keystore buffer to mark. We try to set this
      * high enough to handle any large keystore. Although there is no

src/main/java/com/wolfssl/wolfcrypt/Asn.java

@@ -30,6 +30,10 @@
  */
 public class Asn extends WolfObject {
 
+    /** Default Asn constructor. */
+    public Asn() {
+    }
+
     /** Maximum encoded signature size */
     public static final int MAX_ENCODED_SIG_SIZE = 512;