drm/radeon: enable smc fan control on SI

Working now with Oleg's last round of fixes.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/si_dpm.c

@@ -6953,7 +6953,6 @@ int si_dpm_init(struct radeon_device *rdev)
 			rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
 
 	si_pi->fan_ctrl_is_in_default_mode = true;
-	rdev->pm.dpm.fan.ucode_fan_control = false;
 
 	return 0;
 }