[SCSI] pm80xx: Added SPCv/ve specific hardware functionalities and relevant changes...

[SCSI] pm80xx: Added SPCv/ve specific hardware functionalities and relevant changes in common files

Implementation of SPCv/ve specific hardware functionality and
macros. Changing common functionalities wrt SPCv/ve operations.
Conditional checks for SPC specific operations.

Signed-off-by: Sakthivel K <[email protected]>
Signed-off-by: Anand Kumar S <[email protected]>
Acked-by: Jack Wang <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: James Bottomley <[email protected]>