Revert "Revert "Unlock user 0 before unlocking other user""

This reverts commit 37aa7edc.

Issue for failing startUser for user 0 is addressed as a new CL in framework side.

Bug: 124460424
Test: Test system bootup (for 1st boot and subsequent boot) with next patch
Change-Id: I62d9bbfaeef2bd361b1ec280c92c5e65a13bb45b