drm/radeon/dpm: remove unnecessary checks in dpm_init

No need to check rdev->pm.num_power_states; this is a vestige
of the old pm code.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_pm.c

@@ -1192,7 +1192,6 @@ static int radeon_pm_init_dpm(struct radeon_device *rdev)
 	rdev->pm.dpm_enabled = true;
 	radeon_pm_compute_clocks(rdev);
 
-	if (rdev->pm.num_power_states > 1) {
 	ret = device_create_file(rdev->dev, &dev_attr_power_dpm_state);
 	if (ret)
 		DRM_ERROR("failed to create device file for dpm state\n");
@@ -1212,7 +1211,6 @@ static int radeon_pm_init_dpm(struct radeon_device *rdev)
 	}
 
 	DRM_INFO("radeon: dpm initialized\n");
-	}
 
 	return 0;
 }