drm/radeon/dpm: add debugfs support for ON/LN

This allows you to look at the current DPM state via
debugfs.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index 39f5d96..958d30f 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -565,6 +565,8 @@
 u32 sumo_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void sumo_dpm_print_power_state(struct radeon_device *rdev,
 				struct radeon_ps *ps);
+void sumo_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						      struct seq_file *m);
 
 /*
  * cayman