drm/amd: Use amdgpu_device_should_use_aspm on navi umd pstate switching

The `program_aspm` callback is already guarded for aspm, but the
`enable_aspm` callback doesn't follow the module parameter.

Update it to use the helper `amdgpu_device_should_use_aspm`.
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nv.c

@@ -637,7 +637,8 @@ static int nv_update_umd_stable_pstate(struct amdgpu_device *adev,
 		adev->gfx.funcs->update_perfmon_mgcg(adev, !enter);
 
 	if (!(adev->flags & AMD_IS_APU) &&
-	    (adev->nbio.funcs->enable_aspm))
+	    (adev->nbio.funcs->enable_aspm) &&
+	     amdgpu_device_should_use_aspm(adev))
 		adev->nbio.funcs->enable_aspm(adev, !enter);
 
 	return 0;