The EFS data can either be in a partition or a filesystem path. The rmtfs
allows both, but there is only a systemd service to use the former.
Add another systemd service that does the latter. By default, the EFS path
is /var/lib/rmtfs (which is the directory used by msm-cros-efs-loader.sh
and other tools that extract the EFS data) but this can be changed during
build by setting the RMTFS_EFS_PATH environment variable.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
