Claude review: Revert "dt-bindings: display: bridge: ldb: Add check for reg and reg-names"

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

Patch Review

This reverts commit `8aa2f0ac08d3`, removing the `reg` requirement from the `required:` list and the conditional `reg-names` requirement for non-imx6sx variants.

**Changes reviewed:**

```yaml
-  - reg
```
removed from the `required:` block, and the entire conditional block:
```yaml
-  - if:
-      not:
-        properties:
-          compatible:
-            contains:
-              const: fsl,imx6sx-ldb
-    then:
-      required:
-        - reg-names
```
is also removed.

**Assessment:** Correct. The commit message clearly explains why — the syscon register ranges have multi-purpose registers and `reg` per sub-device is wrong. The revert is clean and the remaining schema (`fsl,ldb.yaml`) remains valid without the `reg` requirement.

**Minor nit:** The commit message has a typo "controlls" (should be "controls") — same typo appears in patches 2 and 3. Not blocking.

**No issues.**

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