crypto: hisilicon/qm - fix use of 'dma_map_single'

Calling 'dma_map_single' after the data is written to
ensure that the cpu cache and dma cache are consistent.

Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>