x86/hyperv: remove unused linux/version.h header

That header is not needed in hv_proc.c.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yongjun Zheng <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20210326064942.3263776-1-zhengyongjun3@huawei.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>