arm: dts: lpc32xx: add labels to all defined peripheral nodes

To simplify writing of dts files for all lpc32xx.dtsi users who adjust
device node properties, add labels to all defined peripheral device
nodes in lpc32xx.dtsi.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

arch/arm/boot/dts/lpc32xx.dtsi

@@ -49,7 +49,7 @@ mlc: flash@200a8000 {
 			status = "disabled";
 		};
 
-		dma@31000000 {
+		dma: dma@31000000 {
 			compatible = "arm,pl080", "arm,primecell";
 			reg = <0x31000000 0x1000>;
 			interrupts = <0x1c 0>;
@@ -58,21 +58,21 @@ dma@31000000 {
 		/*
 		 * Enable either ohci or usbd (gadget)!
 		 */
-		ohci@31020000 {
+		ohci: ohci@31020000 {
 			compatible = "nxp,ohci-nxp", "usb-ohci";
 			reg = <0x31020000 0x300>;
 			interrupts = <0x3b 0>;
 			status = "disabled";
 		};
 
-		usbd@31020000 {
+		usbd: usbd@31020000 {
 			compatible = "nxp,lpc3220-udc";
 			reg = <0x31020000 0x300>;
 			interrupts = <0x3d 0>, <0x3e 0>, <0x3c 0>, <0x3a 0>;
 			status = "disabled";
 		};
 
-		clcd@31040000 {
+		clcd: clcd@31040000 {
 			compatible = "arm,pl110", "arm,primecell";
 			reg = <0x31040000 0x1000>;
 			interrupts = <0x0e 0>;
@@ -118,7 +118,7 @@ i2s0: i2s@20094000 {
 				reg = <0x20094000 0x1000>;
 			};
 
-			sd@20098000 {
+			sd: sd@20098000 {
 				compatible = "arm,pl18x", "arm,primecell";
 				reg = <0x20098000 0x1000>;
 				interrupts = <0x0f 0>, <0x0d 0>;
@@ -243,7 +243,7 @@ uart7: serial@4001c000 {
 				status = "disabled";
 			};
 
-			rtc@40024000 {
+			rtc: rtc@40024000 {
 				compatible = "nxp,lpc3220-rtc";
 				reg = <0x40024000 0x1000>;
 				interrupts = <0x34 0>;
@@ -256,7 +256,7 @@ gpio: gpio@40028000 {
 				#gpio-cells = <3>; /* bank, pin, flags */
 			};
 
-			watchdog@4003C000 {
+			watchdog: watchdog@4003C000 {
 				compatible = "nxp,pnx4008-wdt";
 				reg = <0x4003C000 0x1000>;
 			};
@@ -268,21 +268,21 @@ watchdog@4003C000 {
 			 * them
 			 */
 
-			adc@40048000 {
+			adc: adc@40048000 {
 				compatible = "nxp,lpc3220-adc";
 				reg = <0x40048000 0x1000>;
 				interrupts = <0x27 0>;
 				status = "disabled";
 			};
 
-			tsc@40048000 {
+			tsc: tsc@40048000 {
 				compatible = "nxp,lpc3220-tsc";
 				reg = <0x40048000 0x1000>;
 				interrupts = <0x27 0>;
 				status = "disabled";
 			};
 
-			key@40050000 {
+			key: key@40050000 {
 				compatible = "nxp,lpc3220-key";
 				reg = <0x40050000 0x1000>;
 				interrupts = <54 0>;