- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ACK. Code inspected. Driver changes NOT unit tested or compile tested.
Acked-by: N"Salyzyn, Mark" <mark_salyzyn@adaptec.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>