Allow non-owner users to have managed profiles.

In the split system user model:
The only users that are not allowed to have managed profiles are:
- purely system user (user 0)
- guest users
- restricted profiles
- managed profiles

In the non-split system user model, the behavior does not change:
only the primary user can have managed profiles.

BUG:22956426
Change-Id: If908c30f110fd3e740770174f050c9b6cf87ce1b