[SCSI] pm8001: fix endian issue with code optimization.

1. Fix endian issue.
2. Fix the following warning :
    " drivers/scsi/pm8001/pm8001_hwi.c:2932:32: warning: comparison
      between ‘enum sas_device_type’ and ‘enum sas_dev_type’".
3. Few code optimization.

Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/pm8001/pm8001_chips.h b/drivers/scsi/pm8001/pm8001_chips.h
index 4efa4d0..9241c78 100644
--- a/drivers/scsi/pm8001/pm8001_chips.h
+++ b/drivers/scsi/pm8001/pm8001_chips.h
@@ -46,9 +46,9 @@
 	return *((u32 *)virt_addr);
 }
 
-static inline void pm8001_write_32(void *addr, u32 offset, u32 val)
+static inline void pm8001_write_32(void *addr, u32 offset, __le32 val)
 {
-	*((u32 *)(addr + offset)) = val;
+	*((__le32 *)(addr + offset)) = val;
 }
 
 static inline u32 pm8001_cr32(struct pm8001_hba_info *pm8001_ha, u32 bar,