[Chameleon] refactor directory of chameleon devices

Create a new directory devices/ for all chameleon devices.

BUG=chromium:567364
TEST=make remote-install to make sure Chameleon is booted successfully.
Verified on samus for following tests.
audio_AudioBasicHDMI
display_Resolution.extended
display_Tearing.extended
display_Tearing.mirrored

Change-Id: I62e5aeb83d81ecfe7c099576bb219d247d01b81b
Reviewed-on: https://chromium-review.googlesource.com/450206
Commit-Ready: Hsu Wei-Cheng <mojahsu@chromium.org>
Tested-by: Hsu Wei-Cheng <mojahsu@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@google.com>
10 files changed