ramips: rt2880: fix pci cells definition

Set the correct number of cells to fix "property has invalid length" dtc
compiler warnings.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ramips/dts/rt2880.dtsi

@@ -193,8 +193,8 @@
 	pci: pci@440000 {
 		compatible = "ralink,rt288x-pci";
 		reg = <0x00440000 0x20000>;
-		#address-cells = <1>;
-		#size-cells = <1>;
+		#address-cells = <3>;
+		#size-cells = <2>;
 		status = "disabled";
 	};