Multiuser support for phones

Allow multi-user for all devices without hardcoding it on

ps2: Remove unnecessary use of sharedpreference
     use putIntForUser to always get/set USER_OWNER's setting
     disable changing the checkbox when not the owner
PS3: move to security
PS4: move to additional options header

Change-Id: Icd53d31efa6b9c42edaf70e6e5e9d8651dc52549
Merge "Multiuser support for phones" into kk44