rust: hrtimer: declare cfi_encoding for hrtimer_restart

The hrtimer callbacks return bindings::hrtimer_restart, which bindgen
generates as c_uint. C calls them through hrtimer->function, which
returns enum hrtimer_restart. kCFI encodes enum types by name even with
integer normalization, so the type ids never match and every call fails
the CFI check.

Generate hrtimer_restart as a newtype with a cfi_encoding, as is done
for lru_status, and adapt HrTimerRestart to the newtype.

Fixes: 8a8afe9349fb ("rust: hrtimer: introduce hrtimer support")
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Tested-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Acked-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261019-rust-cfi-fixes-v1-2-9503472ba738@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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