crypto: hisilicon/qm - Add the default processing branch

The cmd type can be extended. Currently, only four types of cmd
can be processed. Therefor, add the default processing branch
to intercept incorrect parameter input.

Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>