Properly store device policy user restrictions.

Bug: 299302474
Bug: 311687929
Test: btest "android.devicepolicy.cts.UserRestrictionsTest" && atest UserManagerServiceUserInfoTest#testWriteReadDevicePolicyUserRestrictions

Merged-In: I66159f362b45d4c9e322754ff272c373b2557812
Change-Id: I66159f362b45d4c9e322754ff272c373b2557812
(cherry picked from commit 24202a9b15c17739f211ede23d2afbd3be59365b)
2 files changed