ipq40xx: fix dtc warning about /soc/ad-hoc-bus missing a unit name

This patch fixes a dtc warning that shows up for every device
Warning (unit_address_vs_reg): Node /soc/ad-hoc-bus has a reg or ranges property, but no unit name

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4019-bus.dtsi

@@ -19,7 +19,7 @@
 / {
 
 soc {
-	ad_hoc_bus: ad-hoc-bus {
+	ad_hoc_bus: ad-hoc-bus@580000 {
 		compatible = "qcom,msm-bus-device";
 		reg = <0x580000 0x14000>,
 			<0x500000 0x11000>;