amd/powerplay: Add structures required to report configuration change

Add required structures for amd_powerplay_display_configuration_change

Signed-off-by: Eric Yang <eric.yang2@amd.com>
diff --git a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
index 0c58969..eb0f1b2 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
@@ -601,6 +601,7 @@
 	struct pp_power_state    *request_ps;
 	struct pp_power_state    *boot_ps;
 	struct pp_power_state    *uvd_ps;
+	struct amd_pp_display_configuration display_config;
 };