Move PCE label handling from APP to protocol.

Change-Id: I26ae21b27ac2dc9ae3302030f6860e0e371c342c
diff --git a/providers/pcep/topology/BUCK b/providers/pcep/topology/BUCK
index 7a64a61..5b5078d 100644
--- a/providers/pcep/topology/BUCK
+++ b/providers/pcep/topology/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//incubator/api:onos-incubator-api',
     '//protocols/ovsdb/api:onos-protocols-ovsdb-api',
     '//protocols/ovsdb/rfc:onos-protocols-ovsdb-rfc',
     '//apps/pcep-api:onos-apps-pcep-api',