ARM: sun5i: olinuxino: Enable the i2c controllers

The A13-Olinuxino makes use of the 3 i2c controllers found on the Allwinner
A13. Enable them in the device tree.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Tomasz Figa <tomasz.figa@gmail.com>