Claude review: gpu: drm: tyr: use IoMem directly instead of Devres

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

Patch Review

This patch makes `IoMem` lifetime-parameterized and removes the `Devres`/`Arc` wrapping:

```rust
-pub(crate) type IoMem = kernel::io::mem::IoMem<'static, SZ_2M>;
+pub(crate) type IoMem<'a> = kernel::io::mem::IoMem<'a, SZ_2M>;
```

The probe path is simplified from:
```rust
let iomem = Arc::new(request.iomap_sized::<SZ_2M>()?.into_devres()?, GFP_KERNEL)?;
```
to:
```rust
let iomem = request.iomap_sized::<SZ_2M>()?;
```

And all consumers are simplified by removing the `(*iomem).access(dev)?` pattern — functions now take `&IoMem<'_>` directly and call methods on it.

**Minor issue — unused import of `Bound` in gpu.rs:**

In `gpu.rs`, patch 2 removes both uses of `Bound` (in `GpuInfo::new` and `l2_power_on`), but the import is left behind:

```rust
    device::{
        Bound,       // <-- no longer used after this patch
        Device, //
    },
```

After this patch, `Bound` has no remaining uses in `gpu.rs`. `Device` is still needed (for `l2_power_on`'s `dev` parameter used in error logging), but `Bound` should be removed from the import list to avoid an unused-import warning/error. Kernel Rust builds typically have strict lint settings that would catch this.

Otherwise the patch is correct and the simplification is welcome — removing the `Devres` access pattern from the polling closures in `issue_soft_reset` and `l2_power_on` is particularly nice, as the previous code had to re-acquire the `Devres` access on every poll iteration.

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Generated by Claude Code Patch Reviewer