arch: trim qualified paths

Import the std modules used in the crate instead of spelling the full
paths at every use site, and drop the now-unnecessary crate-level
#![expect(clippy::absolute_paths)].

Signed-off-by: Henry Hrvoje Tonkovac <htonkovac@gmail.com>
Assisted-by: Claude:Opus-4.8

arch/src/lib.rs

@@ -8,20 +8,18 @@
 //! Implements platform specific functionality.
 //! Supported platforms: x86_64, aarch64, riscv64.
 
-// TODO: Trim qualified paths in this crate, then drop this expectation.
-#![expect(clippy::absolute_paths)]
-
 use std::collections::BTreeMap;
 use std::str::FromStr;
 use std::sync::Arc;
 use std::{fmt, result};
 
-use serde::de::IntoDeserializer;
+use serde::de::{IntoDeserializer, value};
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
+use vm_memory::bitmap::AtomicBitmap;
 
-type GuestMemoryMmap = vm_memory::GuestMemoryMmap<vm_memory::bitmap::AtomicBitmap>;
-type GuestRegionMmap = vm_memory::GuestRegionMmap<vm_memory::bitmap::AtomicBitmap>;
+type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
+type GuestRegionMmap = vm_memory::GuestRegionMmap<AtomicBitmap>;
 
 /// Type for returning error code.
 #[derive(Debug, Error)]
@@ -74,7 +72,7 @@ pub enum CpuProfile {
 
 // Note that this trait impl is architecture agnostic and may thus reside here.
 impl FromStr for CpuProfile {
-    type Err = serde::de::value::Error;
+    type Err = value::Error;
     fn from_str(s: &str) -> result::Result<Self, Self::Err> {
         Self::deserialize(s.into_deserializer())
     }