Disallow disable of the system shared libs.

bug:28173410

Change-Id: If731f2d90312a083bb940f83431ba3eccf213947
diff --git a/core/java/android/content/pm/IPackageManager.aidl b/core/java/android/content/pm/IPackageManager.aidl
index 0526815..7794075 100644
--- a/core/java/android/content/pm/IPackageManager.aidl
+++ b/core/java/android/content/pm/IPackageManager.aidl
@@ -565,6 +565,7 @@
     boolean setRequiredForSystemUser(String packageName, boolean systemUserApp);
 
     String getServicesSystemSharedLibraryPackageName();
+    String getSharedSystemSharedLibraryPackageName();
 
     boolean isPackageDeviceAdminOnAnyUser(String packageName);