gpu: nova-core: remove imports available from prelude

No functional changes intended.

Signed-off-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260610135716.1013688-1-gary@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

drivers/gpu/nova-core/firmware.rs

@@ -468,11 +468,9 @@ pub(crate) const fn create(
 /// that scheme before nova-core becomes stable, which means this module will eventually be
 /// removed.
 mod elf {
-    use core::mem::size_of;
-
     use kernel::{
         bindings,
-        str::CStr,
+        prelude::*,
         transmute::FromBytes, //
     };
 

drivers/gpu/nova-core/firmware/fwsec/bootloader.rs

@@ -7,7 +7,6 @@
 //! be loaded using PIO.
 
 use kernel::{
-    alloc::KVec,
     device::{
         self,
         Device, //