chameleon: Add a device manager

Add a device manager for future integration.

BUG=chromium:567364
TEST=make remote-install to make sure Chameleon is booted successfully.

Change-Id: I8fb0f0d8f234fa476168dcea5f2bcf124ec5bfc6
Reviewed-on: https://chromium-review.googlesource.com/459464
Commit-Ready: Hsu Wei-Cheng <mojahsu@chromium.org>
Tested-by: Hsu Wei-Cheng <mojahsu@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@google.com>
2 files changed