crypto: hisilicon/qm - Make qm_controller_reset() static

Fix the following sparse warning:

drivers/crypto/hisilicon/qm.c:3079:5: warning: symbol 'qm_controller_reset'
was not declared. Should it be static?

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Reviewed-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>