scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled

scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled

iscsi tcp will first send out data, then calculate and send data
digest. If we don't have BDI_CAP_STABLE_WRITES, the page cache will be
written in spite of the on going writeback. Consequently, wrong digest
will be got and sent to target.

To fix this, set BDI_CAP_STABLE_WRITES when data digest is enabled
in iscsi_tcp .slave_configure callback.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Acked-by: Chris Leech <cleech@redhat.com>
Acked-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(backport upstream commit 89d0c804392bb962553f23dc4c119d11b6bd1675)

conflict:
	drivers/scsi/iscsi_tcp.c

Orabug: 27726302

Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>