rust: remove stabilized features from 1.57.0

Signed-off-by: Miguel Ojeda <[email protected]>

drivers/android/rust_binder.rs

@@ -5,13 +5,7 @@
 //! TODO: This module is a work in progress.
 
 #![no_std]
-#![feature(
-    global_asm,
-    try_reserve,
-    allocator_api,
-    concat_idents,
-    generic_associated_types
-)]
+#![feature(global_asm, allocator_api, concat_idents, generic_associated_types)]
 
 use kernel::{
     io_buffer::IoBufferWriter,

rust/build_error.rs

@@ -13,7 +13,7 @@
 //! functions could still be called in the runtime).
 
 #![no_std]
-#![feature(const_panic, core_panic)]
+#![feature(core_panic)]
 
 /// Panics if executed in const context, or triggers a build error if not.
 #[inline(never)]

rust/kernel/lib.rs

@@ -18,16 +18,13 @@
     concat_idents,
     const_fn_trait_bound,
     const_mut_refs,
-    const_panic,
-    const_unreachable_unchecked,
     doc_cfg,
     generic_associated_types,
     ptr_metadata,
     receiver_trait,
     coerce_unsized,
     dispatch_from_dyn,
-    unsize,
-    try_reserve
+    unsize
 )]
 
 // Ensure conditional compilation based on the kernel configuration works;