dt-bindings: reset: atmel,at91sam9260-reset: add sam9x7

dt-bindings: reset: atmel,at91sam9260-reset: add sam9x7

Add documentation for SAM9X7 reset controller.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Dharma Balasubiramani <dharma.b@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20241010120419.93043-1-varshini.rajendran@microchip.com
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>