Fix odl-model-project pom to include correct version of yang-bindings

- yang-bindings need to be at the revision of the yang.codegen.version
else the code generation will create objects that are not present in
the runtime bindings

Change-Id: I753195ea8fedce178924eee2bb6d2e916bfc66dc
Signed-off-by: Giovanni Meo <gmeo@cisco.com>