dt-bindings: soc: amlogic: canvas: convert to yaml

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

Cc: Maxime Jourdan <mjourdan@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[robh: update title]
Signed-off-by: Rob Herring <robh@kernel.org>