mips: mt76xx: gardena-smart-gateway: Add board_late_init() to set LED def state

This is needed to set the LEDs automatically to a default state, as
configured in the dts.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/board/gardena/smart-gateway-mt7688/board.c b/board/gardena/smart-gateway-mt7688/board.c
index 838dfc2..3a1838e 100644
--- a/board/gardena/smart-gateway-mt7688/board.c
+++ b/board/gardena/smart-gateway-mt7688/board.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <led.h>
 #include <linux/io.h>
 
 #define MT76XX_AGPIO_CFG	0x1000003c
@@ -18,3 +19,11 @@
 
 	return 0;
 }
+
+int board_late_init(void)
+{
+	if (IS_ENABLED(CONFIG_LED))
+		led_default_state();
+
+	return 0;
+}