Revert "Disable multiuser toggle on COPE device and add explanat..."

Revert submission 25262217-fix_mu_for_cope

Reason for revert: This issue requires a different approach to the solution.

Reverted changes: /q/submissionid:25262217-fix_mu_for_cope
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:dc85914ab2050586512b7867bfc27816ddb025c8)
Merged-In: Ic16676a15278b944ab2a3a6535032c37e5ece624
Change-Id: Ic16676a15278b944ab2a3a6535032c37e5ece624