sensitive_pn: add missing phone number for Brazil

- Added number 181
  (http://www.anatel.gov.br/Portal/exibirPortalPaginaEspecial.do?codItemCanal=746&codCanal=277)

Change-Id: I7ee8364116562b5b1976f8c624d79b27c21be100
diff --git a/prebuilt/common/etc/sensitive_pn.xml b/prebuilt/common/etc/sensitive_pn.xml
index 6ca34cd..27d5e07 100644
--- a/prebuilt/common/etc/sensitive_pn.xml
+++ b/prebuilt/common/etc/sensitive_pn.xml
@@ -199,5 +199,6 @@
     <sensitivePN network="724">
         <item>100</item>
         <item>180</item>
+        <item>181</item>
     </sensitivePN>
 </sensitivePNS>
\ No newline at end of file