chore: Update clippy attribute in load_gen module

The cargo-clippy feature is deprecated, and if we update it with the
replacement `clippy` feature, clippy starts yelling at us about just
dropping the `cfg` altogether.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

src/loader_gen/x86_64/mod.rs

@@ -10,7 +10,7 @@
 //! Bindgen autogenerated structs for `x86_64` boot parameters.
 
 #![cfg(any(target_arch = "x86", target_arch = "x86_64"))]
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::all))]
+#![allow(clippy::all)]
 #![allow(dead_code)]
 #![allow(missing_docs)]
 #![allow(non_camel_case_types)]