lpfc: Use pci_(request|release)_mem_regions

Now that we do have pci_request_mem_regions() and pci_release_mem_regions()
at hand, use it in the lpfc driver.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Dick Kennedy <dick.kennedy@broadcom.com>
CC: James Smart <james.smart@avagotech.com>
CC: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
CC: Martin K. Petersen <martin.petersen@oracle.com>