dt-bindings: phy: rockchip: Add missing "phy-supply" property

Several Rockchip PHYs use the "phy-supply" property, but don't
document it. Add it to the current known users.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20250407165607.2937088-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml

@@ -42,6 +42,9 @@ properties:
       - const: phy
       - const: apb
 
+  phy-supply:
+    description: Single PHY regulator
+
   rockchip,enable-ssc:
     type: boolean
     description:

Documentation/devicetree/bindings/phy/phy-rockchip-usbdp.yaml

@@ -47,6 +47,9 @@ properties:
       - const: pcs_apb
       - const: pma_apb
 
+  phy-supply:
+    description: Single PHY regulator
+
   rockchip,dp-lane-mux:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     minItems: 2

Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml

@@ -46,6 +46,9 @@ properties:
   reset-names:
     const: phy
 
+  phy-supply:
+    description: Single PHY regulator
+
   rockchip,phy-grf:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: phandle to the syscon managing the phy "general register files"