dt-bindings: rockchip: grf: Add missing type to 'pcie-phy' node

'pcie-phy' is missing any type. Add 'type: object' to indicate it's a
node.

Signed-off-by: Rob Herring <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Heiko Stuebner <[e-mail]>

Documentation/devicetree/bindings/soc/rockchip/grf.yaml

···
           unevaluatedProperties: false
 
         pcie-phy:
+          type: object
           description:
             Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt