[BattOr] Log platform when flashing BattOr firmware is not supported.
[BattOr] Log platform when flashing BattOr firmware is not supported.

Currently we expect flashing to work on all platforms. When it is reported
that flashing is not supported, we need to know what platform battor_wrapper
thinks is being used.

BUG=chromium:652379

Review-Url: https://codereview.chromium.org/2793013003

catapult-project/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult-csm,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm,sahiljain/catapult,benschmaus/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm,sahiljain/catapult