Convert all imports in the devres to use "kernel vertical" style. Drop
unnecessary imports covered by prelude::*.

Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Signed-off-by: Zhi Wang <zhiw@nvidia.com>
---
 rust/kernel/devres.rs | 43 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/rust/kernel/devres.rs b/rust/kernel/devres.rs
index e01e0d36702d..659f513a72a6 100644
--- a/rust/kernel/devres.rs
+++ b/rust/kernel/devres.rs
@@ -8,13 +8,28 @@
 use crate::{
     alloc::Flags,
     bindings,
-    device::{Bound, Device},
-    error::{to_result, Error, Result},
-    ffi::c_void,
+    device::{
+        Bound,
+        Device, //
+    },
+    error::{
+        to_result, //
+    },
     prelude::*,
-    revocable::{Revocable, RevocableGuard},
-    sync::{aref::ARef, rcu, Completion},
-    types::{ForeignOwnable, Opaque, ScopeGuard},
+    revocable::{
+        Revocable,
+        RevocableGuard, //
+    },
+    sync::{
+        aref::ARef,
+        rcu,
+        Completion, //
+    },
+    types::{
+        ForeignOwnable,
+        Opaque,
+        ScopeGuard, //
+    },
 };
 
 use pin_init::Wrapper;
@@ -241,8 +256,12 @@ pub fn device(&self) -> &Device {
     /// # Examples
     ///
     /// ```no_run
-    /// # #![cfg(CONFIG_PCI)]
-    /// # use kernel::{device::Core, devres::Devres, pci};
+    /// #![cfg(CONFIG_PCI)]
+    /// use kernel::{
+    ///     device::Core,
+    ///     devres::Devres,
+    ///     pci, //
+    /// };
     ///
     /// fn from_core(dev: &pci::Device<Core>, devres: Devres<pci::Bar<0x4>>) -> Result {
     ///     let bar = devres.access(dev.as_ref())?;
@@ -345,7 +364,13 @@ fn register_foreign<P>(dev: &Device<Bound>, data: P) -> Result
 /// # Examples
 ///
 /// ```no_run
-/// use kernel::{device::{Bound, Device}, devres};
+/// use kernel::{
+///     device::{
+///         Bound,
+///         Device, //
+///     },
+///     devres, //
+/// };
 ///
 /// /// Registration of e.g. a class device, IRQ, etc.
 /// struct Registration;
-- 
2.51.0