drm/radeon: remove stray line in old pm code

Looks like a remnant from an old rebase.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_pm.c

@@ -1251,7 +1251,6 @@ static void radeon_pm_compute_clocks_old(struct radeon_device *rdev)
 	if (rdev->pm.num_power_states < 2)
 		return;
 
-	INIT_WORK(&rdev->pm.dpm.thermal.work, radeon_dpm_thermal_work_handler);
 	mutex_lock(&rdev->pm.mutex);
 
 	rdev->pm.active_crtcs = 0;