boards/arm: Add bootloader's led alias to Nordic's boards

MCUboot recently gives possibility to signal its state
using led.
For leverage this feature need to provide proper alias
for the led gpio pin.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

boards/arm/nrf21540dk_nrf52840/nrf21540dk_nrf52840.dts

@@ -131,6 +131,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf51dk_nrf51422/nrf51dk_nrf51422.dts

@@ -80,6 +80,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52833dk_nrf52820/nrf52833dk_nrf52820.dts

@@ -79,6 +79,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52833dk_nrf52833/nrf52833dk_nrf52833.dts

@@ -109,6 +109,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52840dk_nrf52811/nrf52840dk_nrf52811.dts

@@ -80,6 +80,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52840dk_nrf52840/nrf52840dk_nrf52840.dts

@@ -120,6 +120,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52dk_nrf52805/nrf52dk_nrf52805.dts

@@ -72,6 +72,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52dk_nrf52810/nrf52dk_nrf52810.dts

@@ -74,6 +74,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf52dk_nrf52832/nrf52dk_nrf52832.dts

@@ -121,6 +121,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf5340dk_nrf5340/nrf5340_cpuapp_common.dts

@@ -104,6 +104,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpunet.dts

@@ -101,6 +101,7 @@
 		sw1 = &button1;
 		sw2 = &button2;
 		sw3 = &button3;
+		bootloader-led0 = &led0;
 	};
 };
 

boards/arm/nrf9160dk_nrf9160/nrf9160dk_nrf9160_common.dts

@@ -98,6 +98,7 @@
 		sw1 = &button3;
 		sw2 = &button0;
 		sw3 = &button1;
+		bootloader-led0 = &led0;
 	};
 };