dt-bindings: ARM: at91: Document Microchip SAMA5D29 Curiosity

Document device tree binding of SAMA5D29 Curiosity, from Microchip.

Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
Signed-off-by: Mihai Sain <mihai.sain@microchip.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230919124606.26898-2-mihai.sain@microchip.com


Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>