Make SystemUI RTL aware

- see bug #5429822 UI should be mirrored for RTL locales (Arabic, Hebrew, farsi)

Change-Id: Ica88ed68f893d5272691a9207788b65623849dee
diff --git a/packages/SystemUI/res/layout/status_bar_icon.xml b/packages/SystemUI/res/layout/status_bar_icon.xml
index d2ebf9e..063212e 100644
--- a/packages/SystemUI/res/layout/status_bar_icon.xml
+++ b/packages/SystemUI/res/layout/status_bar_icon.xml
@@ -33,8 +33,8 @@
     <TextView android:id="@+id/number"
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content"
-        android:layout_gravity="right|bottom"
-        android:layout_marginRight="1dp"
+        android:layout_gravity="end|bottom"
+        android:layout_marginEnd="1dp"
         android:layout_marginBottom="1dp"
         android:textSize="10sp"
         android:textColor="#ffffffff"