add missing ov_types.py
software/fpga/whacker/utils: fix potential ordering issue
software/fpga/whacker: add start-of-capture/end-of-capture bits to packet header
software/host: cleanup sniffing path code
software/fpga: Register SDRAM outputs

Registering SDRAM outputs helps to improve SDRAM timing. Prequisite for
constraining SDRAM paths.