Claude review: drm/tegra: Explicitly specify PMC instance to use

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

Patch Review

Converts four files: `dc.c`, `dc.h`, `gr3d.c`, `sor.c`. All conversions are straightforward.

In `sor.c`, the error path on PMC lookup failure uses `goto put_aux`:

```c
	sor->pmc = devm_tegra_pmc_get(&pdev->dev);
	if (IS_ERR(sor->pmc)) {
		err = PTR_ERR(sor->pmc);
		goto put_aux;
	}
```

Since this is placed *before* `sor->aux` is ever obtained, the `put_aux` label's `if (sor->aux)` guard prevents any actual harm. But jumping to `put_aux` when aux hasn't been set up yet is misleading -- a direct `return PTR_ERR(sor->pmc)` would be clearer and match the style of the `return -ENOMEM` just above it. Also, `dev_err_probe()` is not used here, unlike most other patches.

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