ARM: dts: Update Integrator/AP PCI v3 compatible

To make a stand-alone PCI driver for the V3 Semiconductor PCI bridge,
we need a proper compatible indicating that we are integrated on the
Integrator/AP platform. Add this.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/integratorap.dts

@@ -153,7 +153,7 @@ pic: pic@14000000 {
 	};
 
 	pci: pciv3@62000000 {
-		compatible = "v3,v360epc-pci";
+		compatible = "arm,integrator-ap-pci", "v3,v360epc-pci";
 		#interrupt-cells = <1>;
 		#size-cells = <2>;
 		#address-cells = <3>;