usb: dwc3: rockchip: Fix PHY documentation links.

Commit 34962fb8070c ("docs: Fix more broken references") replaced the
broken reference to rockchip,dwc3-usb-phy.txt binding for the Qualcomm
DWC3 binding (qcom-dwc3-usb-phy.txt). That's wrong, so replace that
reference for the correct ones.

Fixes: 34962fb8070c ("docs: Fix more broken references")
Signed-off-by: Enric Balletbo i Serra <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/usb/rockchip,dwc3.txt

···
 the node is not important. The content of the node is defined in dwc3.txt.
 
 Phy documentation is provided in the following places:
-Documentation/devicetree/bindings/phy/qcom-dwc3-usb-phy.txt
+Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt - USB2.0 PHY
+Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt     - Type-C PHY
 
 Example device nodes: