drm/panfrost: Remove unused device property

The as_in_use_mask device state variable is no longer in use.

Reviewed-by: Steven Price <[e-mail]>
Reviewed-by: Boris Brezillon <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Adrián Larumbe <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Steven Price <[e-mail]>

drivers/gpu/drm/panfrost/panfrost_device.h

···
 	DECLARE_BITMAP(is_suspended, PANFROST_COMP_BIT_MAX);
 
 	spinlock_t as_lock;
-	unsigned long as_in_use_mask;
 	unsigned long as_alloc_mask;
 	unsigned long as_faulty_mask;
 	struct list_head as_lru_list;

drivers/gpu/drm/panfrost/panfrost_mmu.c

···
 		pm_runtime_put_autosuspend(pfdev->base.dev);
 
 		clear_bit(mmu->as, &pfdev->as_alloc_mask);
-		clear_bit(mmu->as, &pfdev->as_in_use_mask);
 		list_del(&mmu->list);
 	}
 	spin_unlock(&pfdev->as_lock);