dt-bindings: bluetooth: marvell: add 88W8997

Update the documentation with the device tree binding for the Marvell
88W8997 bluetooth device.
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Documentation/devicetree/bindings/net/marvell-bluetooth.yaml

@@ -15,7 +15,9 @@ maintainers:
 
 properties:
   compatible:
-    const: mrvl,88w8897
+    enum:
+      - mrvl,88w8897
+      - mrvl,88w8997
 
 required:
   - compatible