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>

hypervisor/src/lib.rs

@@ -21,6 +21,9 @@
 //! - riscv64 (experimental)
 //!
 
+// TODO: Trim qualified paths in this crate, then drop this expectation.
+#![expect(clippy::absolute_paths)]
+
 /// Architecture specific definitions
 #[macro_use]
 pub mod arch;