dt-bindings: i2c: meson: convert to yaml

Now that we have the DT validation in place, let's convert the device tree
bindings for the Amlogic I2C Controller over to YAML schemas.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>