kernel: remove some unused features

Signed-off-by: Andy-Python-Programmer <andypythonappdeveloper@gmail.com>

Author: Andy-Python-Programmer

src/aero_kernel/src/drivers/uart_16550.rs

@@ -148,7 +148,6 @@ pub macro serial_println {
 #[doc(hidden)]
 pub fn _serial_print(args: fmt::Arguments) {
     COM_1.get().map(|c| {
-        //
         c.lock_irq()
             .write_fmt(args)
             .expect("failed to write to COM1")

src/aero_kernel/src/main.rs

@@ -28,18 +28,15 @@
 
 #![feature(
     custom_test_frameworks,
-    core_intrinsics,
     alloc_error_handler,
     lang_items,
     panic_info_message,
-    thread_local,
     decl_macro,
     ptr_internals,
     linked_list_cursors,
     extern_types,
     new_uninit,
     box_syntax,
-    naked_functions,
     step_trait,
     const_btree_new,
     prelude_import