v2.8.4 Bitstreams FMC250M/FMCPICO_1M + DCC

v2.8.4 for FMC250M Sirius Storage Ring, Sirius Booster and FMCPICO_1M Sirius Photon BPMs with DCC support

What's Changed

• Tweaks for syncing debug counters by @guilhermerc in #88
• Expose switching syncing enable bit on Wishbone by @guilhermerc in #89
• DSPs-to-DCC CDC FIFOs 1-sample delay bug fix by @guilhermerc in #90

Full Changelog: v2.8.3...v2.8.4