This patch cleans up the recent removal of smbus functions proposed by
Arjan and then fixed by Gabriel. Changes are as follow:

1* Discard i2c_smbus_block_process_call, as it isn't used anywhere
   either. I guess that Arjan missed it because it wasn't exported.

2* Document the functions removal, so that people have at least an idea
   that the functions can be restored later if needed.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>