Claude review: drm: bridge: anx7625: enforce CONFIG_USB_ROLE_SWITCH dependency

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

Patch Review

**Kconfig change** (`drivers/gpu/drm/bridge/analogix/Kconfig`):

The change from:
```
depends on TYPEC || !TYPEC
```
to:
```
depends on TYPEC
depends on USB_ROLE_SWITCH
```

is correct. The old `TYPEC || !TYPEC` idiom meant "allow building regardless of TYPEC state but ensure we can't be built-in when TYPEC=m" — effectively making it optional. Changing to a hard `depends on` for both TYPEC and USB_ROLE_SWITCH eliminates all nine problematic tristate combinations and ensures the driver can only be built when both subsystems are available at the right level (built-in or module).

**C code change** (`drivers/gpu/drm/bridge/analogix/anx7625.c`):

Removing the `#if IS_REACHABLE(CONFIG_TYPEC)` / `#else` block with the three empty stub functions (`anx7625_typec_set_status`, `anx7625_typec_register`, `anx7625_typec_unregister`) is the correct cleanup. Since TYPEC is now a hard dependency, these stubs can never be reached. The real implementations remain intact and are now unconditionally compiled.

I verified that after the patch, no `IS_REACHABLE` guards or `#if`/`#else` blocks related to TYPEC remain in the file.

**Minor observation**: The commit message mentions the `Fixes:` tag pointing to `f81455b2d332` which introduced the Type-C support — this is appropriate since that commit introduced the USB_ROLE_SWITCH usage without the corresponding Kconfig dependency.

**No issues found.**

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