classes/base-image: added added location to deploy files to the persistent data partition
classes/base-image: added added location to deploy files to the persistent data partition

See: https://docs.mender.io/1.3/Devices/Partition-layout#deploying-files-to-the-persistent-data-partition

Signed-off-by: Pierre-Jean TEXIER <a4ee2cabad121dc5e19995f1ded171cdfaa10b66@gmail.com>

texierp/meta-warp7-distro,WaRP7/meta-warp7-distro,texierp/meta-warp7-distro,WaRP7/meta-warp7-distro