Replace <compiler.h> with <linux/compiler.h>

Including <linux/compiler.h> is enough for general use.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index fcd9aa9..e0b2561 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -1,7 +1,7 @@
 #ifndef _ASM_IO_H
 #define _ASM_IO_H
 
-#include <compiler.h>
+#include <linux/compiler.h>
 
 /*
  * This file contains the definitions for the x86 IO instructions