board: nuvoton: use an event to replace last_stage_init()

Add a new event which handles this function refer to commit
("91caa3bb89b1 event: Use an event to replace last_stage_init()")

Signed-off-by: Michael Chang <zhang971090220@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/nuvoton/arbel_evb/arbel_evb.c b/board/nuvoton/arbel_evb/arbel_evb.c
index 55e93a7..699e5ca 100644
--- a/board/nuvoton/arbel_evb/arbel_evb.c
+++ b/board/nuvoton/arbel_evb/arbel_evb.c
@@ -4,6 +4,7 @@
  */
 
 #include <dm.h>
+#include <event.h>
 #include <asm/io.h>
 #include <asm/arch/gcr.h>
 #include "../common/uart.h"
@@ -98,9 +99,5 @@
 	return 0;
 }
 
-int last_stage_init(void)
-{
-	board_set_console();
+EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, board_set_console);
 
-	return 0;
-}