dt-bindings: soc: mobileye: OLB is an Ethernet PHY provider on EyeQ5

OLB on EyeQ5 ("mobileye,eyeq5-olb" compatible) is now declared as a
generic PHY provider. Under the hood, it provides Ethernet RGMII/SGMII
PHY support for both MAC instances.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Documentation/devicetree/bindings/soc/mobileye/mobileye,eyeq5-olb.yaml

@@ -51,6 +51,9 @@ properties:
   clock-names:
     const: ref
 
+  '#phy-cells':
+    const: 1
+
 patternProperties:
   '-pins?$':
     type: object
@@ -310,7 +313,7 @@ allOf:
       properties:
         '#reset-cells': false
 
-    # Only EyeQ5 has pinctrl in OLB.
+    # Only EyeQ5 has pinctrl and PHY in OLB.
   - if:
       not:
         properties:
@@ -320,6 +323,8 @@ allOf:
     then:
       patternProperties:
         '-pins?$': false
+      properties:
+        '#phy-cells': false
 
 examples:
   - |