CFT: move servo_lib out of firmwareservice

No reason to bury this library so deep in the firmwareservice.

See what this library does in README.md

BUG=None
TEST=local testing

Change-Id: I8a36c216d1292fc2fd65b104d023e5b9c002ff29
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3345755
Auto-Submit: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
Tested-by: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Otabek Kasimov <otabek@google.com>
Commit-Queue: Jaques Clapauch <jaquesc@google.com>
7 files changed