dt-bindings: serial: actions,owl-uart: convert to dtschema

dt-bindings: serial: actions,owl-uart: convert to dtschema

Convert the Actions Semi Owl UART to newer DT schema.
Created DT schema based on the .txt file which had
`compatible`, `reg` and `interrupts` as the
required properties. This binding is used by Actions S500, S700
and S900 SoC. S700 and S900 use the same UART compatible string.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kanak Shilledar <kanakshilledar111@protonmail.com>
Link: https://lore.kernel.org/r/20240405080235.11563-1-kanakshilledar@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>