Turn on update owner enforcement by default

Fixes: 265264566
Test: atest UpdateOwnershipEnforcementTest
Change-Id: I2be08aa1f8e1be53853f8c008a803eb4cca7ae9d

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -7273,7 +7273,7 @@ public class PackageManagerService implements PackageSender, TestUtilityService
         final long token = Binder.clearCallingIdentity();
         try {
             return DeviceConfig.getBoolean(NAMESPACE_PACKAGE_MANAGER_SERVICE,
-                    PROPERTY_IS_UPDATE_OWNERSHIP_ENFORCEMENT_AVAILABLE, false /* defaultValue */);
+                    PROPERTY_IS_UPDATE_OWNERSHIP_ENFORCEMENT_AVAILABLE, true /* defaultValue */);
         } finally {
             Binder.restoreCallingIdentity(token);
         }