rust: auxiliary: remove unnecessary import

`kernel::str::CStr` is included in the prelude.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://lore.kernel.org/r/20250704-cstr-include-aux-v1-1-e1a404ae92ac@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

rust/kernel/auxiliary.rs

@@ -10,7 +10,6 @@
     driver,
     error::{to_result, Result},
     prelude::*,
-    str::CStr,
     types::{ForeignOwnable, Opaque},
     ThisModule,
 };

samples/rust/rust_driver_auxiliary.rs

@@ -5,8 +5,7 @@
 //! To make this driver probe, QEMU must be run with `-device pci-testdev`.
 
 use kernel::{
-    auxiliary, bindings, c_str, device::Core, driver, error::Error, pci, prelude::*, str::CStr,
-    InPlaceModule,
+    auxiliary, bindings, c_str, device::Core, driver, error::Error, pci, prelude::*, InPlaceModule,
 };
 
 use pin_init::PinInit;