scsi: Remove superfluous #include <linux/async.h> directives

Remove this include directive from code that does not use any functionality
from kernel/async.c.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Daejun Park <[e-mail]>
Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/hisi_sas/hisi_sas.h

···
 #define _HISI_SAS_H_
 
 #include <linux/acpi.h>
-#include <linux/async.h>
 #include <linux/blk-mq.h>
 #include <linux/blk-mq-pci.h>
 #include <linux/clk.h>

drivers/scsi/libsas/sas_discover.c

···
 
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
-#include <linux/async.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_eh.h>
 #include "sas_internal.h"

drivers/scsi/scsi.c

···
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/mutex.h>
-#include <linux/async.h>
 #include <asm/unaligned.h>
 
 #include <scsi/scsi.h>

drivers/scsi/scsi_pm.c

···
 
 #include <linux/pm_runtime.h>
 #include <linux/export.h>
-#include <linux/async.h>
 #include <linux/blk-pm.h>
 
 #include <scsi/scsi.h>

drivers/scsi/scsi_priv.h

···
 #define _SCSI_PRIV_H
 
 #include <linux/device.h>
-#include <linux/async.h>
 #include <scsi/scsi_device.h>
 #include <linux/sbitmap.h>
 

drivers/scsi/sd.c

···
 #include <linux/major.h>
 #include <linux/mutex.h>
 #include <linux/string_helpers.h>
-#include <linux/async.h>
 #include <linux/slab.h>
 #include <linux/sed-opal.h>
 #include <linux/pm_runtime.h>

drivers/scsi/ufs/ufshpb.c

···
  */
 
 #include <asm/unaligned.h>
-#include <linux/async.h>
 
 #include "ufshcd.h"
 #include "ufshpb.h"