DrmAPI: add status usable_in_future

Bug:116738851
Test: vts VtsHalDrmV1_2Target
Change-Id: I7a895ef9e45d581ff565efd6bf6591f39dd66de1
diff --git a/headers/media_plugin/media/drm/DrmAPI.h b/headers/media_plugin/media/drm/DrmAPI.h
index 59bd292..17b9993 100644
--- a/headers/media_plugin/media/drm/DrmAPI.h
+++ b/headers/media_plugin/media/drm/DrmAPI.h
@@ -115,7 +115,8 @@
             kKeyStatusType_Expired,
             kKeyStatusType_OutputNotAllowed,
             kKeyStatusType_StatusPending,
-            kKeyStatusType_InternalError
+            kKeyStatusType_InternalError,
+            kKeyStatusType_UsableInFuture
         };
 
         // Used by sendKeysChange to report the usability status of each