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

Convert TI Davinci SoC bindings to DT schema format using json-schema.

Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>