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/lib/string.c b/arch/x86/lib/string.c
index a1656cc..6c66431 100644
--- a/arch/x86/lib/string.c
+++ b/arch/x86/lib/string.c
@@ -8,9 +8,9 @@
 
 /* From glibc-2.14, sysdeps/i386/memset.c */
 
-#include <compiler.h>
-#include <asm/string.h>
 #include <linux/types.h>
+#include <linux/compiler.h>
+#include <asm/string.h>
 
 typedef uint32_t op_t;