dt-bindings: iio: imu: add icm42688 inside inv_icm42600

Add bindings for ICM-42688-P chip.
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240408090720.847107-2-inv.git-commit@tdk.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/imu/invensense,icm42600.yaml

@@ -32,6 +32,7 @@ properties:
       - invensense,icm42605
       - invensense,icm42622
       - invensense,icm42631
+      - invensense,icm42688
 
   reg:
     maxItems: 1