[SCSI] hpsa: set max sectors instead of taking the default

Set the max hardware sectors in the SCSI host template to 8192
to allow for larger i/o's (8192 is the same limit the cciss
driver currently has.)

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>