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This CL moves EnrollmentStatus to a platform agnostic location so that
it can be used on non-ChromeOS desktop platforms as support for device
accounts is added on those platforms as well.

Bug: 1026261
Change-Id: I47d60c8a033fb45730565b95bf6f5030b1d99fff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1998746Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: anthonyvd <anthonyvd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738207}