move file_system.rs to dedicated sub module

Author: phip1611

uefi/src/fs/file_system.rs renamed to uefi/src/fs/file_system/fs.rs

@@ -1,6 +1,6 @@
 //! Module for [`FileSystem`].
 
-use super::*;
+use super::super::*;
 use crate::fs::path::{validate_path, PathError};
 use crate::proto::media::file::{FileAttribute, FileInfo, FileType};
 use crate::table::boot::ScopedProtocol;

uefi/src/fs/file_system/mod.rs

@@ -0,0 +1,3 @@
+mod fs;
+
+pub use fs::*;