board: gd32e1: add led1 alias to run thread sample.

test with `samples/basic/threads`

Signed-off-by: YuLong Yao <[email protected]>

Author: feilongfl

boards/arm/gd32e103v_eval/gd32e103v_eval.dts

@@ -57,6 +57,7 @@
 
 	aliases {
 		led0 = &yellow_led0;
+		led1 = &yellow_led3;
 		sw0 = &user_key;
 	};
 };