Updating BUCK files to match pom.xml changes

Change-Id: I7fb4bf2acdc2a8933f1037fdbdb6b6ca00ffff1e
diff --git a/providers/openflow/group/BUCK b/providers/openflow/group/BUCK
index 0636c42..98cd938 100644
--- a/providers/openflow/group/BUCK
+++ b/providers/openflow/group/BUCK
@@ -8,6 +8,7 @@
     '//lib:CORE_DEPS',
     '//lib:openflowj',
     '//protocols/openflow/api:onos-of-api',
+    '//providers/openflow/flow:onos-of-provider-flow',
 ]
 
 TEST_DEPS = [