Allow device to be unprovisioned

bug: 12247651
Change-Id: Ib0ec34da708b11a95da66c353d864bb87a6616c9
diff --git a/include/media/drm/DrmAPI.h b/include/media/drm/DrmAPI.h
index fc6b49c..4633b7e 100644
--- a/include/media/drm/DrmAPI.h
+++ b/include/media/drm/DrmAPI.h
@@ -189,6 +189,9 @@
                                                   Vector<uint8_t> &certificate,
                                                   Vector<uint8_t> &wrapped_key) = 0;
 
+        // Remove device provisioning.
+        virtual status_t unprovisionDevice() = 0;
+
         // A means of enforcing the contractual requirement for a concurrent stream
         // limit per subscriber across devices is provided via SecureStop.  SecureStop
         // is a means of securely monitoring the lifetime of sessions. Since playback