board: nuvoton: update console environment variable

If CONFIG_SYS_SKIP_UART_INIT is enabled, calculate the
current baud rate and update the "console" environment
variable.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
diff --git a/board/nuvoton/arbel_evb/arbel_evb.c b/board/nuvoton/arbel_evb/arbel_evb.c
index 59e1a42..8fc56c1 100644
--- a/board/nuvoton/arbel_evb/arbel_evb.c
+++ b/board/nuvoton/arbel_evb/arbel_evb.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <asm/io.h>
 #include <asm/arch/gcr.h>
+#include "../common/uart.h"
 
 #define SR_MII_CTRL_SWR_BIT15	15
 
@@ -90,3 +91,9 @@
 	return 0;
 }
 
+int last_stage_init(void)
+{
+	board_set_console();
+
+	return 0;
+}