adds working buck file to BGPCEP provider

Change-Id: Ia4a9ee37ed57ec0862501ae9b6f622f225d764fc
diff --git a/protocols/pcep/api/BUCK b/protocols/pcep/api/BUCK
index 5ced968..8104425 100644
--- a/protocols/pcep/api/BUCK
+++ b/protocols/pcep/api/BUCK
@@ -3,6 +3,7 @@
     '//protocols/pcep/pcepio:onos-protocols-pcep-pcepio',
     '//apps/pcep-api:onos-apps-pcep-api',
     '//incubator/api:onos-incubator-api',
+    '//lib:netty',
 ]
 
 osgi_jar_with_tests (