dt-bindings: power: reset: atmel,sama5d2-shdwc: add sam9x7

Add shutdown controller DT bindings.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241010120425.93102-1-varshini.rajendran@microchip.com


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>