[silicon_creator] Multi-top Conversion

### Description

Quite a lot of the `sw/device/silicon_creator` code base assumes it's going to run on an EG top.

These dependencies range from hardcoded, EG-specific IP addresses to the code logic expecting EG-specific IP blocks (flash controller, non-DPE key manager, etc) to be present and available.

In order to implement top-specific ROMs that can re-use this libraries and driver, we have to convert it to the multi-top API and use that API to remove the logical couplings on specific IP blocks that may not be present on all tops.