ANDROID: rust: miscdevice: fix formatting

An import was removed from these imports during an LTS merge, which
means that rustfmt now prefers a different formatting of these imports.

Fixes: b3fb80bdc6 ("Merge 6.12.19 into android16-6.12")
Change-Id: I14bbe861e738767a6057a320cbe8cf5cf50f5d05
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

rust/kernel/miscdevice.rs

@@ -20,12 +20,7 @@ use crate::{
     str::CStr,
     types::{AsBytes, ForeignOwnable, Opaque},
 };
-use core::{
+use core::{marker::PhantomData, mem::MaybeUninit, pin::Pin, ptr::NonNull};
-    marker::PhantomData,
-    mem::MaybeUninit,
-    pin::Pin,
-    ptr::NonNull,
-};
 
 /// The kernel `loff_t` type.
 #[allow(non_camel_case_types)]