build: Deny clippy::absolute_paths

Removal of absolute paths is currently in progress. To avoid regressing
those changes add a clippy deny at the workspace level and at the crate
level override with #[expect(clippy::absolute_paths)]

See: #7670

Signed-off-by: Rob Bradford <rbradford@meta.com>

virtio-devices/src/lib.rs

@@ -10,6 +10,9 @@
 
 //! Implements virtio devices, queues, and transport mechanisms.
 
+// TODO: Trim qualified paths in this crate, then drop this expectation.
+#![expect(clippy::absolute_paths)]
+
 use std::io;
 use std::sync::atomic::{AtomicU8, Ordering};