dt-bindings: usb: ti,omap4-musb: Drop duplicate 'usb-phy' property constraints

The deprecated 'usb-phy' property is documented already in usb.yaml and
doesn't need a type definition here. It just needs constraints on how
many entries there are.

As this is a host controller, reference usb-hcd.yaml which then
references usb.yaml.

Fixes: 70fcdc82cf ("dt-bindings: usb: ti,omap4-musb: convert to DT schema")
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260508182556.1759173-1-robh@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/ti,omap4-musb.yaml

@@ -81,9 +81,7 @@ properties:
     const: usb2-phy
 
   usb-phy:
-    $ref: /schemas/types.yaml#/definitions/phandle-array
-    description: Phandle for the PHY device.
-    deprecated: true
+    maxItems: 1
 
   ctrl-module:
     $ref: /schemas/types.yaml#/definitions/phandle
@@ -96,6 +94,9 @@ required:
   - interrupts
   - interrupt-names
 
+allOf:
+  - $ref: usb-hcd.yaml#
+
 unevaluatedProperties: false
 
 examples: