Bump QEMU to 6.1.0, enable virtfs

Update to latest stable version and also enable virtfs, aka virtio-9p.
This is a feature for sharing files between the host and emulated guest,
e.g. useful as a replacement for packaging files during build as ext4
images (which has problems on our CI).

Test: make test
Change-Id: I6b9bf94c90154ae80241684c632e2555cf5874a5
2 files changed
tree: 5c64e618dfc375fb37bbac4e28366cee7f2f9068
  1. aarch64/
  2. crosvm/
  3. cuttlefish/
  4. kvm-unit-tests/
  5. common.inc
  6. Makefile