update prebuilts for L

Change-Id: Id16ed4bda7b42e9ad2b17403ae3f195ca3449076
update audio for L

Change-Id: I60334930758d90e599b36b4829eb4dde7f1578b2
cleanup libs

Change-Id: Ib82f9665dbcc23eabb6947e990e6820fe25556e6
update prebuilt files

Change-Id: I7f057bee179a47b97777a48e3fa5a7c04e206b38
(cherry picked from commit 1c8fbfe804e6bb467aa3dd8d19ffaafb6c504c97)