Claude review: drm/tyr: Use DRM device type alias across driver

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Status: Correct, no issues**

The change is minimal and mechanical:

1. **`file.rs` import update** — Adds `TyrDrmDevice` to the import:
```rust
-use crate::driver::TyrDrmDriver;
+use crate::driver::{
+    TyrDrmDevice,
+    TyrDrmDriver, //
+};
```
`TyrDrmDriver` is still needed because the `DriverFile` impl uses `type Driver = TyrDrmDriver;`. The trailing `//` comment is a `rustfmt` trick to force one-item-per-line formatting — this is a common Rust style convention and matches the existing pattern at the top of the file (e.g., `uapi, //`).

2. **`file.rs` signature update** — `dev_query` uses the alias:
```rust
-        ddev: &drm::Device<TyrDrmDriver>,
+        ddev: &TyrDrmDevice,
```
Correct. Note that `fn open(_dev: &drm::Device<Self::Driver>)` is intentionally left unchanged since it uses the associated type `Self::Driver` through the trait, which is the idiomatic pattern there.

3. **`gem.rs` import and signature update** — Same pattern as `file.rs`:
```rust
-    fn new(_dev: &kernel::drm::Device<TyrDrmDriver>, _size: usize) -> impl PinInit<Self, Error> {
+    fn new(_dev: &TyrDrmDevice, _size: usize) -> impl PinInit<Self, Error> {
```
Correct. The `type Driver = TyrDrmDriver;` associated type is kept since it's required by the trait.

**Minor observation:** As mentioned above, the drm-next tree (`file.rs:3`, `file.rs:27`; `gem.rs:3`, `gem.rs:15`) already has this change applied with the shorter names `TyrDevice`/`TyrDriver`. This patch will not apply to drm-next and appears to target a different base branch. The commit message's rationale about "reducing diffs when multiple series are touching these files" supports this — it's likely a preparatory cleanup for a feature branch.

**Reviewed-by assessment:** The patch is trivially correct for its stated base. No functional concerns.

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