hw/block/nvme: fix missing string representation for ns attachment

Add the missing nvme_adm_opc_str entry for the Namespace Attachment
command.
Signed-off-by: NKlaus Jensen <k.jensen@samsung.com>
Reviewed-by: NGollu Appalanaidu <anaidu.gollu@samsung.com>
Reviewed-by: NKeith Busch <kbusch@kernel.org>

hw/block/nvme.h

@@ -86,6 +86,7 @@ static inline const char *nvme_adm_opc_str(uint8_t opc)
     case NVME_ADM_CMD_SET_FEATURES:     return "NVME_ADM_CMD_SET_FEATURES";
     case NVME_ADM_CMD_GET_FEATURES:     return "NVME_ADM_CMD_GET_FEATURES";
     case NVME_ADM_CMD_ASYNC_EV_REQ:     return "NVME_ADM_CMD_ASYNC_EV_REQ";
+    case NVME_ADM_CMD_NS_ATTACHMENT:    return "NVME_ADM_CMD_NS_ATTACHMENT";
     case NVME_ADM_CMD_FORMAT_NVM:       return "NVME_ADM_CMD_FORMAT_NVM";
     default:                            return "NVME_ADM_CMD_UNKNOWN";
     }