Do sign-off based on the [D1 checklist](https://github.com/lowRISC/mocha/blob/main/doc/proj/stages.md#d1-design-sign-off-checklist) and with support of the [UART design sign-off in OpenTitan](https://github.com/lowRISC/opentitan/pull/615).
Do sign-off based on the D1 checklist and with support of the UART design sign-off in OpenTitan.