Merge "Refresh Android.bp, cargo2android.json, TEST_MAPPING." am: 5bdbcff46b am: 0a8fc67a26 am: d002f98c41 am: d2d27ec8e5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_chacha/+/1912658

Change-Id: I01274f8244bf9c5cc8d6b525a5accf3a5099bbd9