rust: alloc: remove reference-counted wrappers from the alloc crate.

These are no longer used anywhere in the kernel.

Signed-off-by: Wedson Almeida Filho <[email protected]>

Author: wedsonaf

rust/alloc/lib.rs

@@ -178,12 +178,9 @@ pub mod collections;
 pub mod fmt;
 pub mod prelude;
 pub mod raw_vec;
-pub mod rc;
 pub mod slice;
 pub mod str;
 pub mod string;
-#[cfg(target_has_atomic = "ptr")]
-pub mod sync;
 #[cfg(all(not(no_global_oom_handling), target_has_atomic = "ptr"))]
 pub mod task;
 #[cfg(test)]