Claude review: drm/amd/display: dmub_cmd.h: correct all kernel-doc prototype warnings

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

Patch Review

**Status: Good to merge.**

This patch adds proper `@ENUM_VALUE:` kernel-doc annotations to enum values that were missing them, and converts a few `/**` comment blocks to plain `/*` where no kernel-doc content was present.

The changes fall into three categories:

1. **Adding `@VALUE_NAME:` tags** to existing `/**` doc comments — e.g.:
   ```c
   /** @DMUB_CMD__MALL_ACTION_ALLOW: Allows display refresh from MALL. */
   ```
   This follows the standard kernel-doc format for enum values.

2. **Converting `/**` to `/*`** for enums without real documentation content (e.g., `dmub_shared_state_feature_id`, `mclk_switch_mode`, `dmub_idle_opt_dc_power_state`, `dmub_phy_fsm_state`). This is the correct approach — `/**` signals kernel-doc, and if there's no actual kernel-doc content, it generates warnings.

3. **Reformatting inline `/**< ... */` comments** into multi-line `/** @NAME: description */` blocks for `dmub_fw_boot_status_bit`. The content is preserved; only the format changes.

Minor nit: in `DMUB_FW_BOOT_STATUS_BIT_ONO_REGIONS_ENABLED`, the original comment said "1 if ONO regions are enabled" but the updated version drops the "1":
```c
/** @DMUB_FW_BOOT_STATUS_BIT_ONO_REGIONS_ENABLED: if ONO regions are enabled */
```
All the other entries in this enum say "1 if ...". This is trivial but inconsistent.

Overall, all three patches are clean, correct, and ready to merge.

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