crypto: hisilicon - use the correct HiSilicon copyright

s/Hisilicon/HiSilicon/g,
according to https://www.hisilicon.com/en/terms-of-use

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Signed-off-by: Hao Fang <fanghao11@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>