Claude review: drm/panthor: Pass an iomem pointer to GPU register access helpers

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

Patch Review

**Status: Good. Acked-by Boris Brezillon.**

This is the foundational change. The `gpu_read`/`gpu_write` helpers change from taking `struct panthor_device *` to `void __iomem *`:

```c
-static inline u32 gpu_read(struct panthor_device *ptdev, u32 reg)
+static inline u32 gpu_read(void __iomem *iomem, u32 reg)
 {
-	return readl(ptdev->iomem + reg);
+	return readl(iomem + reg);
 }
```

All callers are updated to pass `ptdev->iomem` where they previously passed `ptdev`. This is a pure mechanical transformation with no behavioral change.

The `read_poll_timeout` / `read_poll_timeout_atomic` call sites are also updated correctly — passing `ptdev->iomem` as the argument to `gpu_read`:

```c
 	ret = read_poll_timeout(gpu_read, val,
 			val & MCU_STATUS_DISABLED,
-			100, 1000, false, ptdev,
+			100, 1000, false, ptdev->iomem,
 			MCU_CONTROL);
```

No issues.

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