boards: arm: nucleo_l152re: Add die-temp0 alias

Add die-temp0 alias to die_temp node.
The die_temp_polling sample uses this alias.

Signed-off-by: Kotaro SHIOTA <[email protected]>

Author: KOTAROshiota

boards/arm/nucleo_l152re/nucleo_l152re.dts

@@ -41,6 +41,7 @@
 		sw0 = &user_button;
 		eeprom-0 = &eeprom;
 		watchdog0 = &iwdg;
+		die-temp0 = &die_temp;
 	};
 };