Claude review: drm/tyr: Use register! macro for JOB_CONTROL

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

Patch Review

Replaces four `Register<OFFSET>` constants and one `bit_u32` constant with typed `register!` definitions in a `job_control` module.

```rust
pub(crate) JOB_IRQ_RAWSTAT(u32) @ 0x1000 {
    30:0    csg;
    31:31   glb => bool;
}
```

The CSG field is 31 bits wide (bits 30:0), correctly matching the hardware where each bit corresponds to one CSG slot. The GLB bit at 31 is correctly typed as bool. The four register definitions (RAWSTAT, CLEAR, MASK, STATUS) mirror the same field layout, which is correct.

The old `JOB_IRQ_GLOBAL_IF` (`bit_u32(31)`) is replaced by the `glb` field accessor. The `bits::bit_u32` import is also removed since it was the last user. Clean.

No issues with this patch.

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