添加rtthread相关代码

riscv/rtthread/components/dfs/dfs_v2/filesystems/cromfs/SConscript

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+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+CPPPATH = [cwd]
+
+group = DefineGroup('Filesystem', src, depend = ['RT_USING_DFS','RT_USING_DFS_CROMFS'], CPPPATH = CPPPATH)
+
+Return('group')

riscv/rtthread/components/dfs/dfs_v2/filesystems/cromfs/dfs_cromfs.h

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+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020/08/21     ShaoJinchun  firset version
+ */
+
+#ifndef  __DFS_CROMFS_H__
+#define  __DFS_CROMFS_H__
+
+int dfs_cromfs_init(void);
+
+#endif  /*__DFS_CROMFS_H__*/