mpt3sas: Added mpt2sas driver definitions

mpt3sas: Added mpt2sas driver definitions

1. Added mpt2sas driver related macros in mpt3sas header files

2. Made scsi host's, raid class', pci's, ioctl's callback functions
global so that both drivers can use them.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Orabug: 22529571
(cherry picked from commit 8a7e4c24e08fceb94887eb6d8123d6059dc5ddcd)
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>