boards: st: nucleo_n657x0: added missing led aliases.

Fixes 'samples/basic/threads' example build.

Signed-off-by: David Siorpaes <david.siorpaes@st.com>

Author: siorpaes

boards/st/nucleo_n657x0_q/nucleo_n657x0_q_common.dtsi

@@ -48,6 +48,8 @@
 
 	aliases {
 		led0 = &green_led;
+		led1 = &blue_led;
+		led2 = &red_led;
 		sw0 = &user_button;
 	};
 };