[SCSI] qla2xxx: Set correct cabling state during initialization.

Previous work to add asynchronous-scsi-scanning support
(d19044c3) caused peculiar
semantic changes when no cabling was attached to the HBA
whereby unneeded and intrusive 'error-handling' would take
place due to the initial link state being unset.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>