i2c: Remove NOP i2c_algorithm.algo_control() methods

This removes NOP implementations of i2c_algorithm.algo_control.

With this change, there are no implementations of this hook in
the kernel.org tree ... that hook seems about ripe to remove.

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