Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/drivers/flowspec/BUCK b/drivers/flowspec/BUCK
index c62d3a3..baeeed9 100644
--- a/drivers/flowspec/BUCK
+++ b/drivers/flowspec/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:KRYO',
     '//drivers/default:onos-drivers-default',
     '//apps/flowspec-api/flowapi:onos-apps-flowspec-api-flowapi',
 ]