Claude review: arm64: dts: qcom: sc8280xp-arcata: model the PMU of the on-board wcn6855

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

Patch Review

**Issue: Deprecated BT supply name.** The WCN6855 PMU node itself is correct and matches the X13s exactly. The wifi supply rewiring and removal of `regulator-always-on` from `vreg_s11b`/`vreg_s12b` are correct.

However, the **bluetooth node uses `vddrfa1p7-supply`** which is marked as **deprecated** in the binding (`Documentation/devicetree/bindings/net/bluetooth/qcom,wcn6855-bt.yaml`). The binding requires `vddrfa1p8-supply`, and the X13s uses `vddrfa1p8-supply`:

```diff
# Patch 09 (arcata) - uses deprecated name:
+		vddrfa1p7-supply = <&vreg_pmu_rfa_1p7>;

# X13s reference - uses correct name:
		vddrfa1p8-supply = <&vreg_pmu_rfa_1p7>;
```

The commit message says "Use the fixed BT vddrfa1p7-supply supply name to align with bindings" but this is the opposite of what the binding requires — `vddrfa1p7` is deprecated and `vddrfa1p8` is required. Notably, the **wifi node** in the same patch correctly uses `vddrfa1p8-supply`, making this inconsistency more obvious:

```
+		vddrfa1p8-supply = <&vreg_pmu_rfa_1p7>;  /* wifi - correct */
```

This should be changed to `vddrfa1p8-supply` to match the binding and the X13s.

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