Add method to check if IA prefix option takes 0 lifetimes.

Bug: 260934173
Test: TH
Change-Id: If49a888198a52bf0cfefc125e0aa9636c1692279

staticlibs/device/com/android/net/module/util/structs/IaPrefixOption.java

@@ -107,6 +107,13 @@ public class IaPrefixOption extends Struct {
         return true;
     }
 
+    /**
+     * Check whether or not IA Prefix option has 0 preferred and valid lifetimes.
+     */
+    public boolean withZeroLifetimes() {
+        return preferred == 0 && valid == 0;
+    }
+
     /**
      * Build an IA_PD prefix option with given specific parameters.
      */