crypto: hisilicon/qm - remove unneeded data storage

The dump_show() is used to output hardware information for error locating.
It is not need to apply for memory to temporarily store the converted data.
It can directly output the data. Therefore, remove some unnecessary code.

Signed-off-by: Junchong Pan <panjunchong@hisilicon.com>
Signed-off-by: Yang Shen <shenyang39@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>