Merge remote-tracking branch...

Merge remote-tracking branch 'origin/ib-chrome-platform-cros-ec-sysfs-debugfs-for-v4.17' into working-branch-for-4.17

Merging Enric's cros-ec sysfs and debugfs fixes from immutable branch.

Signed-off-by: Benson Leung <bleung@chromium.org>