ARM: dts: exynos: fix PCI bus dtc warnings

dtc recently added PCI bus checks. Fix these warnings.
Signed-off-by: NRob Herring <robh@kernel.org>
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos5440.dtsi

@@ -317,6 +317,7 @@
 		phys = <&pcie_phy0>;
 		ranges = <0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
 			  0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */
+		bus-range = <0x00 0xff>;
 		#interrupt-cells = <1>;
 		interrupt-map-mask = <0 0 0 0>;
 		interrupt-map = <0x0 0 &gic 53>;
@@ -339,6 +340,7 @@
 		phys = <&pcie_phy1>;
 		ranges = <0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
 			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */
+		bus-range = <0x00 0xff>;
 		#interrupt-cells = <1>;
 		interrupt-map-mask = <0 0 0 0>;
 		interrupt-map = <0x0 0 &gic 56>;