rockchip: rk3188: move spl_board_init() into rk3188.c

Clean up the rk3188.c so that we can re-use the common spl board file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3188/rk3188.c b/arch/arm/mach-rockchip/rk3188/rk3188.c
index f7e12a9..7a0b10a 100644
--- a/arch/arm/mach-rockchip/rk3188/rk3188.c
+++ b/arch/arm/mach-rockchip/rk3188/rk3188.c
@@ -60,3 +60,39 @@
 #endif
 	return 0;
 }
+
+#ifdef CONFIG_SPL_BUILD
+static int setup_led(void)
+{
+#ifdef CONFIG_SPL_LED
+	struct udevice *dev;
+	char *led_name;
+	int ret;
+
+	led_name = fdtdec_get_config_string(gd->fdt_blob, "u-boot,boot-led");
+	if (!led_name)
+		return 0;
+	ret = led_get_by_label(led_name, &dev);
+	if (ret) {
+		debug("%s: get=%d\n", __func__, ret);
+		return ret;
+	}
+	ret = led_set_on(dev, 1);
+	if (ret)
+		return ret;
+#endif
+
+	return 0;
+}
+
+void spl_board_init(void)
+{
+	int ret;
+
+	ret = setup_led();
+	if (ret) {
+		debug("LED ret=%d\n", ret);
+		hang();
+	}
+}
+#endif