rust: quote: add SPDX License Identifiers

Originally, when the Rust upstream `alloc` standard library crate was
vendored in commit 057b8d2 ("rust: adapt `alloc` crate to the
kernel"), the SPDX License Identifiers were added to every file so that
the license on those was clear.

Thus do the same for the `quote` crate.

This makes `scripts/spdxcheck.py` pass.

Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-13-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/quote/ext.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use super::ToTokens;
 use core::iter;
 use proc_macro2::{TokenStream, TokenTree};

rust/quote/format.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 /// Formatting macro for constructing `Ident`s.
 ///
 /// <br>

rust/quote/ident_fragment.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use alloc::borrow::Cow;
 use core::fmt;
 use proc_macro2::{Ident, Span};

rust/quote/lib.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 //! [![github]](https://github.com/dtolnay/quote) [![crates-io]](https://crates.io/crates/quote) [![docs-rs]](https://docs.rs/quote)
 //!
 //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github

rust/quote/runtime.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use self::get_span::{GetSpan, GetSpanBase, GetSpanInner};
 use crate::{IdentFragment, ToTokens, TokenStreamExt};
 use core::fmt;

rust/quote/spanned.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use crate::ToTokens;
 use proc_macro2::extra::DelimSpan;
 use proc_macro2::{Span, TokenStream};

rust/quote/to_tokens.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use super::TokenStreamExt;
 use alloc::borrow::Cow;
 use alloc::rc::Rc;