linux/docker: install docker-ce from upstream

When docker not pre-installed, install docker-ce from upstream as it is
already available on ARM now. Refer to: https://get.docker.com/

Change-Id: If6b7d953e1770f847be8b9b85a56c66bf01d356b
Signed-off-by: Chase Qi <chase.qi@linaro.org>
2 files changed