ASoC: dt-bindings: microchip: add sam9x7

Add sam9x7 compatible in the DT documentation.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240223172657.672439-1-varshini.rajendran@microchip.com


Signed-off-by: Mark Brown <broonie@kernel.org>