devicetree: bindings: designware-pcie: Fix unit address

Remove the 0x in the unit address because it shouldn't be there.

Cc: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: NStephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>

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

@@ -31,7 +31,7 @@ Optional properties:
 
 Example configuration:
 
-	pcie: pcie@0xdffff000 {
+	pcie: pcie@dffff000 {
 		compatible = "snps,dw-pcie";
 		reg = <0xdffff000 0x1000>, /* Controller registers */
 		      <0xd0000000 0x2000>; /* PCI config space */