Claude review: drm: verisilicon: DRM_VERISILICON_DC should depend on ARCH_THEAD

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

Patch Review

**Commit message:** Clear and well-written. Correctly explains the rationale (driver only supports DC8200 in TH1520), notes the Fixes tag, and mentions that the dependency can be relaxed later.

**Code change:**

```diff
-	depends on RISCV || COMPILE_TEST
+	depends on ARCH_THEAD || COMPILE_TEST
```

This is correct. `ARCH_THEAD` is defined under `arch/riscv/Kconfig.socs` and already implies `RISCV`, so the architecture constraint is preserved while being more specific. The `COMPILE_TEST` alternative is properly kept so build-testing coverage is not lost.

The pattern matches what other T-HEAD peripheral drivers use throughout the tree. For example, `drivers/firmware/Kconfig:216` and `drivers/clk/thead/Kconfig:5` both have the identical `depends on ARCH_THEAD || COMPILE_TEST` construct.

**Fixes tag:** References `dbf21777caa8b8c8 ("drm: verisilicon: add a driver for Verisilicon display controllers")` which is appropriate — this is the commit that introduced the overly broad dependency.

**No issues found.** 

Reviewed-by worthy as-is.

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