feat support ext sdram for xishutong-arm32 board

Ubiquitous/XiZi_IIoT/board/xishutong-arm32/third_party_driver/include/connect_sdram.h

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+/*
+* Copyright (c) 2020 AIIT XUOS Lab
+* XiUOS is licensed under Mulan PSL v2.
+* You can use this software according to the terms and conditions of the Mulan PSL v2.
+* You may obtain a copy of Mulan PSL v2 at:
+*        http://license.coscl.org.cn/MulanPSL2
+* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+* See the Mulan PSL v2 for more details.
+*/
+ 
+/**
+* @file connect_sdram.h
+* @brief define xishutong-arm32-board sdram function and struct
+* @version 2.0
+* @author AIIT XUOS Lab
+* @date 2023-02-09
+*/
+
+#include <device.h>
+#include <hc32_ll_fcg.h>
+#include <hc32_ll_gpio.h>
+#include <hc32_ll_dmc.h>
+#include <hc32_ll_clk.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int ExtSdramInit(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+