dt-bindings: gnss: u-blox: add u-blox,neo-9m compatible

Add compatible for u-blox NEO-9M GPS module.

Signed-off-by: Alejandro Enrique <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>

Author: alejandroenrique-geotab

Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml

@@ -18,10 +18,14 @@ description: >
 
 properties:
   compatible:
-    enum:
-      - u-blox,neo-6m
-      - u-blox,neo-8
-      - u-blox,neo-m8
+    oneOf:
+      - enum:
+          - u-blox,neo-6m
+          - u-blox,neo-8
+          - u-blox,neo-m8
+      - items:
+          - const: u-blox,neo-m9
+          - const: u-blox,neo-m8
 
   reg:
     description: >