i2c: Drop i2c_adapter.id

There is no user left of i2c_adapter.id, so we can get rid of it.
Finally! :)

Signed-off-by: Jean Delvare <[e-mail]>

Documentation/feature-removal-schedule.txt

···
 
 ----------------------------
 
-What:	i2c_adapter.id
-When:	June 2011
-Why:	This field is deprecated. I2C device drivers shouldn't change their
-	behavior based on the underlying I2C adapter. Instead, the I2C
-	adapter driver should instantiate the I2C devices and provide the
-	needed platform-specific information.
-Who:	Jean Delvare <[e-mail]>
-
-----------------------------
-
 What:	cancel_rearming_delayed_work[queue]()
 When:	2.6.39
 

include/linux/i2c.h

···
  */
 struct i2c_adapter {
 	struct module *owner;
-	unsigned int id __deprecated;
 	unsigned int class;		  /* classes to allow probing for */
 	const struct i2c_algorithm *algo; /* the algorithm to access the bus */
 	void *algo_data;