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

Data type of the 'tag' field of 'fw_flash_Update_resp' should be __le32.

Data type of 'pHeader' should be __le32.  Remove 2nd cast to 'piomb'.

Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>