ARM: imx6: add pci config space as platform resource

Fixes "imx6q-pcie 1ffc000.pcie: missing *config* reg space"
error exposed by new versions of the designware pcie driver.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt

@@ -17,7 +17,9 @@ Example:
 
 	pcie@0x01000000 {
 		compatible = "fsl,imx6q-pcie", "snps,dw-pcie";
-		reg = <0x01ffc000 0x4000>;
+		reg = <0x01ffc000 0x04000>,
+		      <0x01f00000 0x80000>;
+		reg-names = "dbi", "config";
 		#address-cells = <3>;
 		#size-cells = <2>;
 		device_type = "pci";

arch/arm/boot/dts/imx6qdl.dtsi

@@ -137,7 +137,9 @@ L2: l2-cache@00a02000 {
 
 		pcie: pcie@0x01000000 {
 			compatible = "fsl,imx6q-pcie", "snps,dw-pcie";
-			reg = <0x01ffc000 0x4000>; /* DBI */
+			reg = <0x01ffc000 0x04000>,
+			      <0x01f00000 0x80000>;
+			reg-names = "dbi", "config";
 			#address-cells = <3>;
 			#size-cells = <2>;
 			device_type = "pci";