driver model: constify attribute groups

Let attribute group vectors be declared "const".  We'd
like to let most attribute metadata live in read-only
sections... this is a start.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/device.h b/include/linux/device.h
index 3f33f17..e19e40a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -131,7 +131,7 @@
 	void (*shutdown) (struct device *dev);
 	int (*suspend) (struct device *dev, pm_message_t state);
 	int (*resume) (struct device *dev);
-	struct attribute_group **groups;
+	const struct attribute_group **groups;
 
 	const struct dev_pm_ops *pm;
 
@@ -288,7 +288,7 @@
  */
 struct device_type {
 	const char *name;
-	struct attribute_group **groups;
+	const struct attribute_group **groups;
 	int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 	char *(*nodename)(struct device *dev);
 	void (*release)(struct device *dev);
@@ -412,7 +412,7 @@
 
 	struct klist_node	knode_class;
 	struct class		*class;
-	struct attribute_group	**groups;	/* optional groups */
+	const struct attribute_group **groups;	/* optional groups */
 
 	void	(*release)(struct device *dev);
 };