flashprog: add the additional project after flashrom developer split in 2023

### Package Name flashprog ### Maintainer none ### OpenWrt Version ANY ### OpenWrt Target/Subtarget ANY ### Steps to Reproduce The last time the flashrom package got updated in OpenWrt was the beginning of the year 2023. Since then there was a important change in the flashrom ecosystem. There was a split at the core developers. Now there are two independent projects out there each containing different functionality. Sometimes you need flashrom, sometimes you need flashrprog. It is important to have both packages in OpenWrt to have the full functionality for flashing related workloads. https://flashprog.org ### Actual Behaviour Currently only flashrom is part of the OpenWrt packages. Just updating it https://github.com/openwrt/packages/issues/29590 , wont add all the functions that have been added since 2023 to the flashing functionality toolset. ### Confirmation Checklist - [x] The package is maintained in this repository. - [x] I understand that issues related to [the base OpenWrt repository](https://github.com/openwrt/openwrt/issues) or [LuCI repository](https://github.com/openwrt/luci/issues) will be closed. - [x] I am reporting an issue for OpenWrt, not an unsupported fork.