Add board support for gd32vf103 longan nano

hw/bsp/gd32vf103_longan_nano/nuclei_sdk_hal.h

@@ -0,0 +1,20 @@
+// See LICENSE for license details.
+#ifndef _NUCLEI_SDK_HAL_H
+#define _NUCLEI_SDK_HAL_H
+
+#include "nmsis_gcc.h"
+#include "gd32vf103.h"
+#include "gd32vf103_libopt.h"
+#include "drv_usb_hw.h"
+#include "drv_usb_dev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SOC_DEBUG_UART      USART0
+
+#ifdef __cplusplus
+}
+#endif
+#endif