dt-bindings: microchip: atmel,at91rm9200-tcb: add sam9x7 compatible

Add support for sam9x7 device compatible with sama5d2 compatible as the
fallback as the sam9x7 SoC uses the same tcb IP as the latter.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240903064233.49366-1-varshini.rajendran@microchip.com


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