pkg/vcs: fix fuchsia's git repo directory.

This commit changes the fuchsia git repo to make it point to the main
repo instead of just "zircon".

Previously, zircon had its own git repo, so syzkaller had a wrapper that
would issue jiri commands for the whole fuchsia repo, but would just
report commits in the zircon repo.

Recently, fuchsia merged most of its repositories in just one big git
repo. So now, zircon is part of the fuchsia git repo. I think the code
continued working because the old zircon repo is still part of a git
repository, so git commands worked there.

The new code now doesn't have any special casing for Zircon, and now
(almost) everything is part of the fuchsia repo. The other repos are now
git submodules.

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