sysfs: use file mode defines from stat.h

With the last patches stat.h was included to the header, and thus those
permission defines should be used.
Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/sysfs.h

@@ -76,11 +76,12 @@ struct attribute_group {
 }
 
 #define __ATTR_RO(_name) {						\
-	.attr	= { .name = __stringify(_name), .mode = 0444 },	\
+	.attr	= { .name = __stringify(_name), .mode = S_IRUGO },	\
 	.show	= _name##_show,						\
 }
 
-#define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store)
+#define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO),		\
+			 _name##_show, _name##_store)
 
 #define __ATTR_NULL { .attr = { .name = NULL } }