fs/reference_count: set default reference count option to n

Most of developers will not have the scenarios of open/close file descriptors in multi-threads,
The default option will incur additional code size overhead for such devices.
this PR will preserve the behavior before PR#13296 was introduced, and ensure that the default code size is not affected.

Note that this option will ensure the safety of access to the file
system from multi-tasks (Task A blocking rw(fd), then Task B close(fd)),
the disadvantage is that it will increase the amount of code-size,
there is no need to enable this option if the application could ensure
he file operations are safe.

Signed-off-by: chao an <[email protected]>

fs/Kconfig

@@ -121,11 +121,17 @@ config FS_HEAPSIZE
 
 config FS_REFCOUNT
 	bool "File reference count"
-	default !DEFAULT_SMALL
+	default n
 	---help---
 		Enable will Records the number of filep references. The file is
 		actually closed when the count reaches 0
 
+		Note that this option will ensure the safety of access to the file
+		system from multi-tasks (Task A blocking rw(fd), then Task B close(fd)),
+		the disadvantage is that it will increase the amount of code-size,
+		there is no need to enable this option if the application could ensure
+		he file operations are safe.
+
 source "fs/vfs/Kconfig"
 source "fs/aio/Kconfig"
 source "fs/semaphore/Kconfig"