[SCSI] qla2xxx: Correct regression in DMA-mask setting prior to allocations.

Jeremy Higdon noted
(http://marc.info/?l=linux-scsi&m=123262143131788&w=2

) that the
rework done in commit e315cd28
was not setting the proper consistent and streaming DMA masks
prior to memory allocations.  Correct this and remove the
unnecessary prototype.

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