x86/hyperv: Remove unused include

Remove including <linux/version.h>. It's not needed.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <devel@linuxdriverproject.org>
Cc: <kernel-janitors@vger.kernel.org>
Link: https://lkml.kernel.org/r/1537690822-97455-1-git-send-email-yuehaibing@huawei.com