crypto: hisilicon/hpre - Use helper to set reqsize

mainline inclusion
from mainline-v6.2-rc1
commit 5ba78373
category: feature
bugzilla: https://gitee/com/openeuler/kernel/issues/16VW8E
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ba78373561f12d23c975b0a154104a07866f94b



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The value of reqsize must only be changed through the helper.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Longfang Liu <liulongfang@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: JangShui <yangjiangshui@h-partners.com>