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

arch/x86/hyperv/hv_init.c

@@ -20,7 +20,6 @@
 #include <linux/kexec.h>
 #include <linux/version.h>
 #include <linux/vmalloc.h>
-#include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/hyperv.h>
 #include <linux/slab.h>