i2c: Kill client_register and client_unregister methods

These methods were useful in the legacy binding model but no longer in
the new (standard) binding model. There are no users left so we can
drop them.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>

include/linux/i2c.h

@@ -352,10 +352,6 @@ struct i2c_adapter {
 	const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 	void *algo_data;
 
-	/* --- administration stuff. */
-	int (*client_register)(struct i2c_client *) __deprecated;
-	int (*client_unregister)(struct i2c_client *) __deprecated;
-
 	/* data fields that are valid for all devices	*/
 	u8 level; 			/* nesting level for lockdep */
 	struct mutex bus_lock;