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Previously we manually calculated the rootfs/kernel path using the mount
point of the DLC. This is actually done by concierge now, and we should
use it instead of re-doing the work ourselves.

Bug: b/177367054
Change-Id: Ic3137f9c0b5b3c186e84795ff64329e8b5e2a819
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626607Reviewed-by: Daniel Ng <danielng@google.com>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#843208}