Claude review: drm/panfrost: Prevent division by 0

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

Patch Review

**Status: Correct but very minor scope.**

The fix:
```c
-		status->busy_time / (status->total_time / 100),
+		status->total_time >= 100 ?
+			status->busy_time / (status->total_time / 100) : 0,
```

This is in a `dev_dbg()` call, so it only fires with dynamic debug enabled. The division by zero can occur when `total_time` is an `unsigned long` and `total_time / 100` truncates to 0 for values < 100. The check is correct.

**Nit**: The commit message says "clamp it to 0" when it's really "clamp the percentage display to 0" -- the total_time itself isn't clamped. Also, the 100 ns threshold mentioned in the commit message may confuse readers since `total_time` units aren't necessarily nanoseconds (they depend on ktime conversion).

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