servo: add control to get cr50 board properties

BUG=none
BRANCH=none
TEST=get bob's board properties using the new control

Change-Id: I779af360265057d708b2cbe652e11cecce200821
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1579261
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Namyoon Woo <namyoon@chromium.org>
2 files changed