Specify lint-baseline for docs builds

This file is passed to doclava to baselining existing errors in the
documentation. The contents of this baseline will be added in follow up
changes (and will be different in AOSP and internal).

Bug: 217734059
Test: m docs
Change-Id: Ibb5571fd9e55fb4f04e79e015462812e01d1ca80
2 files changed