Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/incubator/bmv2/model/BUCK b/incubator/bmv2/model/BUCK
index 9f313b6..53bfb14 100644
--- a/incubator/bmv2/model/BUCK
+++ b/incubator/bmv2/model/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
-  '//lib:CORE_DEPS'
+  '//lib:CORE_DEPS',
+  '//lib:minimal-json',
 ]
 
 osgi_jar_with_tests (