Update androidx 1.0.0-alpha1 prebuilts.

Taken from ab/4732178

Test: None
Change-Id: I94ad37492fe3d28df53a5dd35ddd2d1418141261
852 files changed
tree: 51d74a1ca913a211ed0f1ddc58fbb5d57eee266c
  1. android/
  2. androidx/
  3. com/
  4. NOTICE.txt
  5. source.properties