fmc_carrierv2: now using shared I2C bus as the source of C2C reset

In context of deprecation of DI/OT FMC Carrier v1, the C2C reset I2C line can be moved to a shared I2C bus, reducing the platform's resource use.

This MR:

• Leverages the connection of FPGA_I2C/BP_I2C to the PL Fabric
• Liberates SHARED_BUS lines
• Fixes the address of the C2C I2C Reset module to 0x10

Should be merged at the same time as:

• be-cem-edl/diot/zynqmp/boot-image!188 (merged)
• https://gitlab.cern.ch/be-cem-edl/diot/python-diot/-/merge_requests/9

Should only be merged when #26 is closed.

Closes #23