linters: Fix clippy issues

Latest clippy version complains about our existing code for the
following reasons:

- trait objects without an explicit `dyn` are deprecated
- `...` range patterns are deprecated
- lint `clippy::const_static_lifetime` has been renamed to
  `clippy::redundant_static_lifetimes`
- unnecessary `unsafe` block
- unneeded return statement

All these issues have been fixed through this patch, and rustfmt has
been run to cleanup potential formatting errors due to those changes.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

devices/src/ioapic.rs

@@ -188,7 +188,6 @@ impl BusDevice for Ioapic {
             IOWIN_OFF => self.ioapic_write(value),
             _ => {
                 error!("IOAPIC: failed writing at offset {}", offset);
-                return;
             }
         }
     }