sdm: Implement SetDisplayBrightness, GetDisplayBrightness.

Change-Id: Ica0f0bbb2955ad26fa113728ee152a21e6014b6c
CRs-Fixed: 2454377
diff --git a/libdrmutils/drm_interface.h b/libdrmutils/drm_interface.h
index 03c8e0e..918a7fe 100644
--- a/libdrmutils/drm_interface.h
+++ b/libdrmutils/drm_interface.h
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
+* Copyright (c) 2017 - 2020, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -606,6 +606,7 @@
   uint32_t mmWidth;
   uint32_t mmHeight;
   uint32_t type;
+  uint32_t type_id;
   std::vector<DRMModeInfo> modes;
   std::string panel_name;
   DRMPanelMode panel_mode;