Allow low ram device to have multiple users and managed profies

Remove these runtime restrictions of low ram device.
This change wouldn't bring the features onto low ram device, because
manufacturers need to change some configs to enable the features, but
would allow the usage.

Bug: 153016458
Test: build successful; multiple users and managed profiles can be
enabled with config changes

Change-Id: Ibe59219dab7e138d7dae19df77d36477e9e76b8e