x86: ksysfs.c build fix

kbuild test robot report below error for randconfig:

arch/x86/kernel/ksysfs.c: In function 'get_setup_data_paddr':

      data = ioremap_cache(pa_data, sizeof(*data));
      ^

      iounmap(data);
      ^

Fix it by including <asm/io.h> in ksysfs.c

---
 arch/x86/kernel/ksysfs.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/arch/x86/kernel/ksysfs.c
===================================================================
@@ -16,6 +16,7 @@
 #include <linux/stat.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
+#include <asm/io.h>
 
 #include <asm/setup.h>
 

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