Add DPM methods to allow org owned PO to suspend personal apps

* When personal apps are suspended, only dialer, IMEs, a11y, launcher
  are some other critical apps are exempted.
* User is presented with notification, clicking on which invokes an
  activity in the DPC.

Bug: 147414651
Test: manual via TestDPC
Change-Id: I09f8dad08e54b0ce8201cd5c76b3f34342e0da8f
diff --git a/proto/src/system_messages.proto b/proto/src/system_messages.proto
index ad802ff..54b4201 100644
--- a/proto/src/system_messages.proto
+++ b/proto/src/system_messages.proto
@@ -312,5 +312,9 @@
     // Notify the user that data or apps are being moved to external storage.
     // Package: com.android.systemui
     NOTE_STORAGE_MOVE = 0x534d4f56;
+
+    // Notify the user that the admin suspended personal apps on the device.
+    // Package: android
+    NOTE_PERSONAL_APPS_SUSPENDED = 1003;
   }
 }