Add missing ICU_Delegate methods.

Update the ICU_Delegate to add methods originally added in
I5de58be7e8a701f2c40182ea54bceff85ec1aad2

Change-Id: I536834fe76cbc7dae05580182fee1bea956e3e77

tools/layoutlib/bridge/src/libcore/icu/ICU_Delegate.java

@@ -247,4 +247,14 @@ public class ICU_Delegate {
 
         return true;
     }
+
+    @LayoutlibDelegate
+    /*package*/ static void setDefaultLocale(String locale) {
+        ICU.setDefaultLocale(locale);
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static String getDefaultLocale() {
+        return ICU.getDefaultLocale();
+    }
 }