This updates the lockfile path for FHS 3.0 since powerd as well
as other pieces of software are migrating over.
BUG=chromium:616620
CQ-DEPEND=CL:351271
BRANCH=none
TEST=compiled
Change-Id: I6aa5fa30225e45039316e4a3af0e50cdef0fdf4e
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/351345
Reviewed-by: Dan Erat <derat@chromium.org>