Claude review: dt-bindings: display: msm: qcm2290: Add Shikra MDSS

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

Patch Review

This patch updates three YAML binding files to accept Shikra compatibles alongside QCM2290.

**Design concern — fallback compatibles**: Since the cover letter states Shikra "reuses the same MDSS/DPU 6.5 hardware as QCM2290" with "the same register layout," the idiomatic DT approach for identical hardware is to use fallback compatibles. For example, the MDSS binding would express:

```yaml
compatible:
  items:
    - enum:
        - qcom,shikra-mdss
    - const: qcom,qcm2290-mdss
```

This keeps Shikra's own compatible for future-proofing while allowing the driver to match on the existing `qcom,qcm2290-mdss` entry — no driver code changes needed. The same applies to the DPU and DSI controller compatibles. DT maintainers (Krzysztof, Rob) typically prefer this pattern.

**qcom,qcm2290-mdss.yaml changes look correct**: The `select:` block is properly added to ensure the schema matches both compatible values. The `patternProperties` for DPU and DSI child nodes are correctly extended.

**DSI controller binding in dsi-controller-main.yaml**: Adding `qcom,shikra-dsi-ctrl` in alphabetical order is correct. The DSI node in the MDSS binding properly pairs it with `qcom,mdss-dsi-ctrl` as fallback, which is consistent with how other SoCs work.

**Nit**: The title update from "QCM220" to "QCM2290" is a good fix of a pre-existing typo, but mixing a typo fix into a feature patch is slightly unusual. Not a blocker.

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