vmm: Remove long unnecessary comment in register_msi()

fix(tests/spectre-meltdown-checker): pin due to bugs in tip

pci: refactor: use PciSBDF type instead of raw u32

pci: refactor: rename PciBdf to PciSBDF

pci: refactor: use smallest types where possible

pci: refactor: bring pci/mod.rs into vmm/pci

pci: refactor: add uniform derives and allow missing_docs

pci: refactor: remove PciSubclass trait

pci: refactor: update PciClassCode

pci: refactor: delete unused types

pci: refactor: remove dead code from PciBdf impl

utils: use correct function for getting host page size

fmt: rust formatting

chore(deps): Bump the firecracker group across 1 directory with 21 updates

CHANGELOG: Mention serial console hang after snapshot