Add ms to legacy unit infos
Add ms to legacy unit infos

This is to remove inconsistency between legacy_unit_info.py and
legacy_unit_info.html. HTML version, used in chart_json_converter,
has 'ms' defined as legacy unit, while python one doesn't.

Bug: chromium:981349
Change-Id: I9ce13c55bdcb97e9b79301bbd411b32a4cf38e25
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/1853224
Reviewed-by: Juan Antonio Navarro Pérez <1649bb5e6b9eafe026580e338065dc64ba6b80b2@chromium.org>
Commit-Queue: Mikhail Khokhlov <26a5474f563e73cb4d4e9a12e954c50f60aae4c8@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult