Claude review: drm/panel: hx83121a: select DRM_DISPLAY_DSC_HELPER

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

Patch Review

**Status: Good to merge**

The problem is clear: `panel-himax-hx83121a.c` includes `<drm/display/drm_dsc_helper.h>` and calls `drm_dsc_pps_payload_pack()` at line 116:

```c
drm_dsc_pps_payload_pack(&pps, &ctx->dsc);
```

But the Kconfig entry was missing the corresponding `select DRM_DISPLAY_DSC_HELPER`, causing a link-time failure:

```
undefined reference to `drm_dsc_pps_payload_pack'
```

The fix adds the missing `select`:

```diff
+	select DRM_DISPLAY_DSC_HELPER
 	select DRM_KMS_HELPER
```

The placement is correct — it's inserted alphabetically before `DRM_KMS_HELPER`, consistent with how other panel drivers order their `select` statements.

The `Fixes:` tag correctly references `a7c61963b727 ("drm/panel: Add Himax HX83121A panel driver")`, which is the commit that introduced the driver with the missing dependency.

No concerns with this patch.

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