hardware_Trackpad: config for area of palm/thumb detection

This CL adds new functionalities for the area of palm/thumb
detection. It also takes care of the situation when there is
no need of subname and subprompt in a functionality.

BUG=chromium-os:19703
TEST=Run trackpad record program. It should execute normally.
$ cd /usr/local/autotest/tests/hardware_Trackpad/
$ ./trackpad_record.py

Change-Id: I4716ecd55adbc34810195df67ffaa6b657421c99
Reviewed-on: http://gerrit.chromium.org/gerrit/6715
Reviewed-by: Joseph Shyh-In Hwang <josephsih@chromium.org>
Tested-by: Joseph Shyh-In Hwang <josephsih@chromium.org>
2 files changed