dt-bindings: arm: Convert Amlogic board/soc bindings to json-schema

Convert Amlogic SoC bindings to DT schema format using json-schema.

Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
[khilman: updated maninainers]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>