Fix boot loop when upgrading direclty from L to N

A second attempt to fix the upgrade problem due to SID == 0
in the above upgrade path. The previous fix contains a bug
where it would cause future attempts to unify work challenge
to silently fail, and crash SystemUi when unlocking.

This fix adds a check for non-zero SID before doing the initial work
profile unification (which caused the upgrade crash when SID == 0).
This means the initial work profile unification would only happen when
the user has unlocked the lockscreen and SID is generated.

Bug: 32490092
Bug: 33050562
Change-Id: Ib28951b2ec26b4f091df7763d9902f55616fcb5c

services/core/java/com/android/server/LockSettingsService.java

@@ -240,6 +240,17 @@ public class LockSettingsService extends ILockSettings.Stub {
             if (DEBUG) Slog.v(TAG, "Parent does not have a screen lock");
             return;
         }
+        // Do not tie when the parent has no SID (but does have a screen lock).
+        // This can only happen during an upgrade path where SID is yet to be
+        // generated when the user unlocks for the first time.
+        try {
+            if (getGateKeeperService().getSecureUserId(parentId) == 0) {
+                return;
+            }
+        } catch (RemoteException e) {
+            Slog.e(TAG, "Failed to talk to GateKeeper service", e);
+            return;
+        }
         if (DEBUG) Slog.v(TAG, "Tie managed profile to parent now!");
         byte[] randomLockSeed = new byte[] {};
         try {