clean up unused variable:
1. ring_lru_list
2. ring_lru_list_lock
related-commit:
drm/amdgpu: remove ring lru handling
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
        /* link all shadow bo */
        struct list_head                shadow_list;
        struct mutex                    shadow_list_lock;
-       /* keep an lru list of rings by HW IP */
-       struct list_head                ring_lru_list;
-       spinlock_t                      ring_lru_list_lock;
 
        /* record hw reset is performed */
        bool has_hw_reset;
 
        INIT_LIST_HEAD(&adev->shadow_list);
        mutex_init(&adev->shadow_list_lock);
 
-       INIT_LIST_HEAD(&adev->ring_lru_list);
-       spin_lock_init(&adev->ring_lru_list_lock);
-
        INIT_DELAYED_WORK(&adev->delayed_init_work,
                          amdgpu_device_delayed_init_work_handler);
        INIT_DELAYED_WORK(&adev->gfx.gfx_off_delay_work,