Claude review: samples: rust: rust_driver_pci: use HRT lifetime for Bar

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

Patch Review

Major rewrite demonstrating the end-to-end improvement. Before: the sample driver needed `Arc`, `Devres`, `RevocableMutex`, `ARef`, and `PinnedDrop`. After:

```rust
+struct SampleDriverData<'bound> {
+    _bar: pci::Bar<'bound>,
+    dev: &'bound pci::Device<Bound>,
+}
```

The `probe` function is dramatically simpler — no manual devres registration, no revocable wrappers:

```rust
+    fn probe<'bound>(
+        dev: &'bound mut pci::Device<Bound>,
+        _info: &pci::DeviceId,
+    ) -> Result<Pin<KBox<SampleDriverData<'bound>>>> {
+        let bar = dev.iomap_region_sized::<{ SampleDriver::MEM_SIZE }>(0)?;
+        dev_info!(dev.as_ref(), "PCI base address: {:p}\n", bar.io_addr());
+        KBox::try_pin_init(try_pin_init!(SampleDriverData {
+            _bar: bar,
+            dev: dev.into(),
+        }), GFP_KERNEL)
+    }
```

This is the best demonstration of the series' value. The code is clearer, safer (compile-time vs. runtime checks), and shorter.

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