drm/amdkfd: Make deallocate_hiq_sdma_mqd static

Fix sparse warning:

drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_device_queue_manager.c:1846:6:
 warning: symbol 'deallocate_hiq_sdma_mqd' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

@@ -1814,7 +1814,8 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 	return NULL;
 }
 
-void deallocate_hiq_sdma_mqd(struct kfd_dev *dev, struct kfd_mem_obj *mqd)
+static void deallocate_hiq_sdma_mqd(struct kfd_dev *dev,
+				    struct kfd_mem_obj *mqd)
 {
 	WARN(!mqd, "No hiq sdma mqd trunk to free");