Import AndroidX from build 7687115

./update_prebuilts.py -x 7687115

Bug: 197802324
Test: Global presubmit
Change-Id: Ibdb05d5c1329e6c146c64fa91c6fa76c57cb6d9b
Merged-In: Ibdb05d5c1329e6c146c64fa91c6fa76c57cb6d9b
(cherry picked from commit 7b9de4bddcdfb6c1c249f189afa68f79b1e6a9af)
1513 files changed