Chrome OS: Remove enrollment UI from md_login.

Enrollment could not be started after device is configured. So this code
is unused.

Bug: 926638
Change-Id: I7e70d79b3e438bd50b79754a6614a4e712c0573f
Reviewed-on: https://chromium-review.googlesource.com/c/1460302
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632552}
3 files changed