rust: init: remove unneeded `#[allow(clippy::disallowed_names)]`

rust: init: remove unneeded `#[allow(clippy::disallowed_names)]`

These few cases, unlike others in the same file, did not need the `allow`.

Thus clean them up.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Tested-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://lore.kernel.org/r/20240904204347.168520-10-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>