arm64: dts: mediatek: Enable I2C support for 96Boards X20 Development board

There are 7 I2C ports used on this board. Hence, enable all of them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200222162444.11590-4-manivannan.sadhasivam@linaro.org


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>