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Define mojo format MtpFileEntry to mirror the MTP protobuf message.
Use this struct in MediaTransferProtocolManager and related code.

This is a preparation work for MTP servicification.

BUG=769630

Change-Id: Ia01f5bc7c00fdcc258f50ae02e7a375caa83d6c9
Reviewed-on: https://chromium-review.googlesource.com/812964
Commit-Queue: Ke He <ke.he@intel.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524349}