am 32afccc7: Revert "Default host module tag to optional."

Merge commit '32afccc732a6d7c631d2ba4d8a818fcbe2162903' into gingerbread-plus-aosp

* commit '32afccc732a6d7c631d2ba4d8a818fcbe2162903':
  Revert "Default host module tag to optional."