[PATCH tip/efi-kexec] x86: ksysfs.c build fix

[Dave Young]

kbuild test robot report below error for randconfig:

   arch/x86/kernel/ksysfs.c: In function 'get_setup_data_paddr':
>> arch/x86/kernel/ksysfs.c:81:3: error: implicit declaration of function 'ioremap_cache' [-Werror=implicit-function-declaration]
      data = ioremap_cache(pa_data, sizeof(*data));
      ^
>> arch/x86/kernel/ksysfs.c:86:3: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
      iounmap(data);
      ^
Fix it by including <asm/io.h> in ksysfs.c

Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
---
 arch/x86/kernel/ksysfs.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/arch/x86/kernel/ksysfs.c
===================================================================
--- linux.orig/arch/x86/kernel/ksysfs.c
+++ 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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