The ManagedProvisioning xml's were moved in Pie.
Also added missing managed_device and managed_user xml's.
This fixes 'Android for Work'.

REF: https://github.com/LineageOS/android_packages_apps_ManagedProvisioning/commit/ebe73b6e94e65fc82fde2c482844a05deb84e806
     https://github.com/LineageOS/android_frameworks_base/commit/b6a9f94d6718894fdd382708a9d87696f055e71e

Change-Id: If911b4ee1890600e47af73c7fe0fcca4dc73eb26