remove IC25 I/O expander
After fixing the bug with double connection of the FMC I/Os that are used as JTAG, we now have 6 available FPGA pins. Adding PCB_INFO I2C (which is used only to connect IC25) we have in total 8 available FPGA pins.
We can get rid of the whole PCB_INFO bus and IC25, reduce board ID bus to 4 bits (8 bits is too many) and connect directly to the FPGA the following signals:
- ID0..3
- PGOOD.P12V
- PGOOD.P3V3
- PGOOD.P2V5