Convert `use` imports to vertical layout for better readability and
maintainability.

Signed-off-by: Guru Das Srinagesh <linux@gurudas.dev>
---
Came across a recent commit bc58905eb07 ("samples: rust_misc_device: use
vertical import style") and found a few more locations that could
benefit from this cleanup. No functional changes.

Separating out patches per-subsystem as per the review feedback in [0].

Tested via:

	$ make LLVM=1 rustfmtcheck || echo "fail"
	$

[0]: https://lore.kernel.org/lkml/20260628-b4-rust-vertical-imports-v1-0-98bc71d4810b@gurudas.dev/
---
 samples/rust/rust_dma.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs
index 5046b4628d0e..c46af109f4aa 100644
--- a/samples/rust/rust_dma.rs
+++ b/samples/rust/rust_dma.rs
@@ -12,9 +12,13 @@
         Device,
         DmaMask, //
     },
-    page, pci,
+    page,
+    pci, //
     prelude::*,
-    scatterlist::{Owned, SGTable},
+    scatterlist::{
+        Owned,
+        SGTable, //
+    },
     sync::aref::ARef,
 };
 
---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260705-rfl-vert-imp-d12bdbe397c7
Best regards,
--  
Guru Das Srinagesh <linux@gurudas.dev>