boards/arm/thingy53_nrf5340: Add mcuboot's gpio aliases

Added aliases for the button and LED gpio pin which might be used
by the MCUboot.

Signed-off-by: Andrzej Puzdrowski <[email protected]>

Author: nvlsianpu

boards/arm/thingy53_nrf5340/thingy53_nrf5340_common.dts

@@ -114,6 +114,8 @@
 		magn0 = &bmm150;
 		watchdog0 = &wdt0;
 		accel0 = &adxl362;
+		mcuboot-button0 = &button1;
+		mcuboot-led0 = &blue_led;
 	};
 };