enter_chroot: make sure /run/lock is usable

This dir needs to exist for tools to use.

BUG=b:198104067
TEST=CQ passes

Change-Id: I89e972e654a8efe51ef5973abdc87858d026996f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3198597
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
1 file changed