dt-bindings: PCI: MediaTek: Remove un-used property

The "num-lanes" property is not used, remove it.

Signed-off-by: Honghui Zhang <[e-mail]>
Signed-off-by: Lorenzo Pieralisi <[e-mail]>

Documentation/devicetree/bindings/pci/mediatek-pcie.txt

···
   explanation.
 - ranges: Sub-ranges distributed from the PCIe controller node. An empty
   property is sufficient.
-- num-lanes: Number of lanes to use for this port.
 
 Examples for MT7623:
 
···
 			interrupt-map-mask = <0 0 0 0>;
 			interrupt-map = <0 0 0 0 &sysirq GIC_SPI 193 IRQ_TYPE_LEVEL_LOW>;
 			ranges;
-			num-lanes = <1>;
 		};
 
 		pcie@1,0 {
···
 			interrupt-map-mask = <0 0 0 0>;
 			interrupt-map = <0 0 0 0 &sysirq GIC_SPI 194 IRQ_TYPE_LEVEL_LOW>;
 			ranges;
-			num-lanes = <1>;
 		};
 
 		pcie@2,0 {
···
 			interrupt-map-mask = <0 0 0 0>;
 			interrupt-map = <0 0 0 0 &sysirq GIC_SPI 195 IRQ_TYPE_LEVEL_LOW>;
 			ranges;
-			num-lanes = <1>;
 		};
 	};
 
···
 			#size-cells = <2>;
 			#interrupt-cells = <1>;
 			ranges;
-			num-lanes = <1>;
 			interrupt-map-mask = <0 0 0 7>;
 			interrupt-map = <0 0 0 1 &pcie_intc0 0>,
 					<0 0 0 2 &pcie_intc0 1>,
···
 			#size-cells = <2>;
 			#interrupt-cells = <1>;
 			ranges;
-			num-lanes = <1>;
 			interrupt-map-mask = <0 0 0 7>;
 			interrupt-map = <0 0 0 1 &pcie_intc1 0>,
 					<0 0 0 2 &pcie_intc1 1>,
···
 			#size-cells = <2>;
 			#interrupt-cells = <1>;
 			ranges;
-			num-lanes = <1>;
 			interrupt-map-mask = <0 0 0 7>;
 			interrupt-map = <0 0 0 1 &pcie_intc0 0>,
 					<0 0 0 2 &pcie_intc0 1>,
···
 			#size-cells = <2>;
 			#interrupt-cells = <1>;
 			ranges;
-			num-lanes = <1>;
 			interrupt-map-mask = <0 0 0 7>;
 			interrupt-map = <0 0 0 1 &pcie_intc1 0>,
 					<0 0 0 2 &pcie_intc1 1>,