This patch contains the overdue removal of three I2C drivers.

[JD: In fact only i2c-ixp4xx can be removed at the moment, the other two
platforms don't implement the generic GPIO layer yet.]
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NJean Delvare <khali@linux-fr.org>