chroot_version_hooks: Add new hook for removed binhosts

A number of old binhosts have been dropped. Add new version hook
to clean out the old configs that reference the dropped binhosts.

BUG=None
TEST=run_chroot_version_hooks

Change-Id: Ie205da53f08235ab66389dd07007f78fd2fbe5e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1863311
Tested-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
diff --git a/chroot_version_hooks.d/170_deleted_binhosts_cleanup b/chroot_version_hooks.d/170_deleted_binhosts_cleanup
new file mode 120000
index 0000000..7bac7f7
--- /dev/null
+++ b/chroot_version_hooks.d/170_deleted_binhosts_cleanup
@@ -0,0 +1 @@
+169_deleted_binhosts_cleanup
\ No newline at end of file