Import AndroidX from build 8484248

    ./update_prebuilts.py -x 8484248

Need to fix a severe accessibility bug.
Test: build
Bug: 221303983

Change-Id: I62c922d67f5871ebddc8a497e7542e011f41e7d1
Merged-In: I33cf04d287379053d75b2ab1bfe6300fd9f342c1
20 files changed