scsi: staging: unisys: Remove the shost_attrs member

This patch prepares for removal of the shost_attrs member from struct
scsi_host_template.

Link: https://lore.kernel.org/r/20211012233558.4066756-45-bvanassche@acm.org


Acked-by: David Kershner <david.kershner@unisys.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>