Reformat some BUILD files according to the buildifier guidelines

Change-Id: I8aa599f89fc14296275193475e50eb8f27b4bf0a
diff --git a/models/common/BUILD b/models/common/BUILD
index 3b845b3..e019d87 100644
--- a/models/common/BUILD
+++ b/models/common/BUILD
@@ -1,7 +1,7 @@
 load("//tools/build/bazel:yang.bzl", "yang_model")
 
 yang_model(
-  app_name = "org.onosproject.models.common",
-  title = "Common YANG Models",
-  custom_registrator = True,
+    app_name = "org.onosproject.models.common",
+    custom_registrator = True,
+    title = "Common YANG Models",
 )