Add GKI 5.15 prebuilts

Test: repo init & repo sync
Bug: 205665920

Change-Id: I0493b7f9a35522a930c92f8689bf95ec79fd13e0
1 file changed
tree: f9fdf7370566c62c70df522ff10aafe751a4fe4d
  1. default.xml
  2. GLOBAL-PREUPLOAD.cfg