Enterprise Enrollment: Add legacy serial number key for Mario devices.
Enterprise Enrollment: Add legacy serial number key for Mario devices.

BUG=chromium-os:18198
TEST=Enroll Mario device, check serial number received by the server.


Review URL: http://codereview.chromium.org/7540021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@94917 0039d316-1c4b-4281-b951-d872f2087c98

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