[SCSI] ufs: use module_pci_driver

Use macro module_pci_driver and get rid of boilerplate code.  No
functional changes.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Acked-by: Santosh Y <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>