Switch certs to a writable partition

Certs folder to point to a writable partition.
Alternative here would be `/var/run/docker/certs`

BUG=b:330123362
TEST=Tested the change on the box

Change-Id: Ic3b5af504ddc3c62b3fece1516da962e56ce4880
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/moblab/+/6063358
Auto-Submit: Michal Matyjek <mmatyjek@google.com>
Reviewed-by: Jacek Klimkowicz <klimkowicz@google.com>
Tested-by: Michal Matyjek <mmatyjek@google.com>
Commit-Queue: Jacek Klimkowicz <klimkowicz@google.com>
1 file changed