rockchip: rk3399: Add weak led_setup()

Add weak led_setup() so that board which has an uncommon
led setup code that can make use of custom implementation.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/rk3399/rk3399.c

@@ -241,8 +241,14 @@ static void rk3399_force_power_on_reset(void)
 }
 #endif
 
+void __weak led_setup(void)
+{
+}
+
 void spl_board_init(void)
 {
+	led_setup();
+
 #if defined(SPL_GPIO_SUPPORT)
 	struct rockchip_cru *cru = rockchip_get_cru();