lib: posix: fs: add rmdir support

Implementation of rmdir, Posix style file
system API to remove directory

Signed-off-by: Karthikeyan Krishnasamy <[email protected]>

Author: karthi012

include/zephyr/posix/unistd.h

@@ -44,6 +44,7 @@ int rename(const char *old, const char *newp);
 int unlink(const char *path);
 int stat(const char *path, struct stat *buf);
 int mkdir(const char *path, mode_t mode);
+int rmdir(const char *path);
 
 FUNC_NORETURN void _exit(int status);
 

lib/posix/options/fs.c

@@ -462,3 +462,13 @@ int fstat(int fildes, struct stat *buf)
 #ifdef CONFIG_POSIX_FILE_SYSTEM_ALIAS_FSTAT
 FUNC_ALIAS(fstat, _fstat, int);
 #endif
+
+/**
+ * @brief Remove a directory.
+ *
+ * See IEEE 1003.1
+ */
+int rmdir(const char *path)
+{
+	return unlink(path);
+}