Claude review: drm/tyr: Add DOORBELL_BLOCK registers

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

Patch Review

Adds definitions for the doorbell register array.

```rust
pub(crate) const NUM_DOORBELLS: usize = 64;
const STRIDE: usize = 0x10000;

register! {
    pub(crate) DOORBELL(u32)[NUM_DOORBELLS, stride = STRIDE] @ 0x80000 {
        0:0    ring => bool;
    }
}
```

64 doorbells at 64KiB stride starting at 0x80000. Each doorbell block occupies a full page to allow per-doorbell memory mapping. The single `ring` bit is write-only (documented in the comment). This is forward-looking infrastructure for future CSF support.

No issues.

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**Summary:** The series is in good shape. The main actionable item is that the `L2_PWRTRANS_HI` offset fix (0x204 -> 0x224) in patch 1 should be called out explicitly in the commit message since it fixes a real bug, not just a naming issue. The rest is clean, well-documented, and correct against the panthor C reference.

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