phy: hisilicon: Use the correct HiSilicon copyright

s/Hisilicon/HiSilicon/g.
It should use capital S, according to the official website.

Signed-off-by: Hao Fang <fanghao11@huawei.com>
Link: https://lore.kernel.org/r/1617278537-26102-1-git-send-email-fanghao11@huawei.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>