Claude review: dt-bindings: display/msm: gpu: Document Adreno 840

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

Patch Review

**Status: Looks good**

Two changes:

1. Converts the reg-layout conditional from `const` to `enum` to include both `qcom,adreno-44050a01` (Adreno 840) and `qcom,adreno-44070001`:

```diff
-            const: qcom,adreno-44070001
+            enum:
+              - qcom,adreno-44050a01
+              - qcom,adreno-44070001
```

2. Adds `qcom,adreno-44050a01` to the "clocks: false" enum list (since clocks are defined in the GMU node for A6xx+):

```diff
               - qcom,adreno-43051401
+              - qcom,adreno-44050a01
               - qcom,adreno-44070001
```

Both changes are correct. The new compatible string is placed in sorted order in both locations. The Adreno 840 shares the same reg layout as 44070001 and follows the same GMU-based clock pattern as other modern Adreno GPUs.

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