[SCSI] isci: ->lldd_ata_check_ready handler

Report to libata whether the link to the given domain_device is up and the
signature fis has been received.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --cc drivers/scsi/isci/init.c
Simple merge

diff --cc drivers/scsi/isci/port.c
Simple merge

diff --cc drivers/scsi/isci/port.h
Simple merge