Allow anyone to modify //build/android/lint/baseline.xml

Bug: 1107950
Change-Id: I8a44ddf86ba16ab28ada77dd0daba4d18fdba38f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310973
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790571}

build/android/lint/OWNERS

+per-file baseline.xml=*