Control lock sceen message on organization-owned device

Grant the profile owner of an organization-owned device the ability to
control the owner information shown on the lock screen.

Bug: 138709470
Test: atest CtsDevicePolicyManagerTestCases:com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest
Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testLockScreenInfo
Change-Id: Ie4e3bd421a655c88a311f1378ef3c265b37502f0