Camera: Docs XML - allow multiple kinds per section: DO NOT MERGE

Camera: Docs XML - allow multiple kinds per section: DO NOT MERGE

- When adding a new entry and maintaining ABI, make a new kind if can't be
  semantically part of the last kind. Don't add to the end of an existing
  non-last kind.

- Print generated file names in metadata-generate

(Aside) New sections should also be ended at the end of the root namespace to
  maintain ABI compatibility.

Change-Id: I5df0a701763af3cc91ee6eead4fe9fd423c9aa86