Firmware Provisioning: add servo/lib

This module allows users to get correct servo-related variables for
flashing, specifically, dut-controls to be run before and after flashing
and the programmer argument.

BUG=None
TEST=unit

Change-Id: I105d22f03a324c3a64105464228b412f978df255
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3321296
Tested-by: Sergey Frolov <sfrolov@google.com>
Auto-Submit: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Otabek Kasimov <otabek@google.com>
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
Commit-Queue: Sergey Frolov <sfrolov@google.com>
3 files changed