ARM: dts: lpc18xx: remove unit addresses from creg childs

DT nodes without reg properties should not have a unit address. This
fixes the following warnings from dtc.

 Warning (unit_address_vs_reg): Node /soc/syscon@40043000/phy@004 has a
 unit name, but no reg property
 Warning (unit_address_vs_reg): Node /soc/syscon@40043000/dma-mux@11c has
 a unit name, but no reg property
Signed-off-by: Joachim Eastwood <manabian@gmail.com>

arch/arm/boot/dts/lpc18xx.dtsi

@@ -201,13 +201,13 @@ creg_clk: clock-controller {
 				#clock-cells = <1>;
 			};
 
-			usb0_otg_phy: phy@004 {
+			usb0_otg_phy: phy {
 				compatible = "nxp,lpc1850-usb-otg-phy";
 				clocks = <&ccu1 CLK_USB0>;
 				#phy-cells = <0>;
 			};
 
-			dmamux: dma-mux@11c {
+			dmamux: dma-mux {
 				compatible = "nxp,lpc1850-dmamux";
 				#dma-cells = <3>;
 				dma-requests = <64>;