dt-bindings: iio: imu: Add inv_icm42600 documentation

Update the required documentation for the icm42631.
Signed-off-by: NJay Greco <grecojay@amazon.com>
Acked-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: NJean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20221110192933.13616-3-grecojay@amazon.comSigned-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

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

@@ -31,6 +31,7 @@ properties:
       - invensense,icm42602
       - invensense,icm42605
       - invensense,icm42622
+      - invensense,icm42631
 
   reg:
     maxItems: 1