redoxfs: import Vec from alloc for no_std builds (bootloader dependency)

src/filesystem.rs

@@ -2,6 +2,7 @@ use aes::Aes128;
 use alloc::{
     collections::{BTreeMap, VecDeque},
     vec,
+    vec::Vec,
 };
 use syscall::error::{Error, Result, EKEYREJECTED, ENOENT, ENOKEY};
 use xts_mode::{get_tweak_default, Xts128};

src/record.rs

@@ -1,4 +1,4 @@
-use alloc::vec;
+use alloc::{vec, vec::Vec};
 use core::ops;
 
 use crate::{BlockLevel, BlockTrait, RECORD_LEVEL};