drm/amdkfd: remove extra use of volatile

as the adding of mb() should be sufficient in function unmap_queues_cpsch,
remove the add of volatile type as recommended

Signed-off-by: Victor Zhao <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 {
 	unsigned long end_jiffies = msecs_to_jiffies(timeout_ms) + jiffies;
 	struct device *dev = dqm->dev->adev->dev;
-	volatile uint64_t *fence_addr = dqm->fence_addr;
+	uint64_t *fence_addr = dqm->fence_addr;
 
 	while (*fence_addr != fence_value) {
 		/* Fatal err detected, this response won't come */

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

···
 	uint16_t		vmid_pasid[VMID_NUM];
 	uint64_t		pipelines_addr;
 	uint64_t		fence_gpu_addr;
-	volatile uint64_t	*fence_addr;
+	uint64_t		*fence_addr;
 	struct kfd_mem_obj	*fence_mem;
 	bool			active_runlist;
 	int			sched_policy;