x86/hyperv: Remove duplicated include in hv_init

Fix following checkinclude.pl warning:
./arch/x86/hyperv/hv_init.c: linux/io.h is included more than once.

The include is in line 13. Remove the duplicated here.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20211026113249.30481-1-wanjiabing@vivo.com


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