Move xz-embedded to the janitors. am: 8b59db4f0a am: 75f71a897e

Original change: https://android-review.googlesource.com/c/platform/external/xz-embedded/+/3093045

Change-Id: I5786353982e6b82abf9eac203a72d2e8f8ff09fa
Signed-off-by: Automerger Merge Worker <[email protected]>