dt-bindings: arm: imx: add imx8mq nitrogen support

The Nitrogen8M is an ARM based single board computer (SBC)
designed to leverage the full capabilities of NXP’s i.MX8M
Quad processor.

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
[Dafna: porting vendor's code to mainline]
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -224,6 +224,7 @@ properties:
       - description: i.MX8MQ based Boards
         items:
           - enum:
+              - boundary,imx8mq-nitrogen8m # i.MX8MQ NITROGEN Board
               - fsl,imx8mq-evk            # i.MX8MQ EVK Board
               - purism,librem5-devkit     # Purism Librem5 devkit
               - technexion,pico-pi-imx8m  # TechNexion PICO-PI-8M evk