touch_updater: Add report_tool_version to chromeos-touch-common.sh

Adds a new utility function "report_tool_version" to
"chromeos-touch-common.sh" to be used to add reports
entry about the updater that was used to initiate a touch firmware
update, or for config updaters.

BUG=b:397567795
TEST=CQ
TEST=Run \
     `cros build-packages --board=${BOARD} chromeos-base/touch_updater \
     && cros deploy ${DUT} chromeos-base/touch_updater \
     && ssh ${DUT} reboot` \
     then validated tool and version in firmware report file on DUT.

Change-Id: Ifcc76600807a94e0ac0a0437a8099df701b23d28
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/6375383
Reviewed-by: Henry Barnor <hbarnor@chromium.org>
Reviewed-by: Ray Xu <rayxu@google.com>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
Tested-by: Henry Barnor <hbarnor@chromium.org>
2 files changed