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

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

Change-Id: I8c5ef1c4e1969f8928fcc6a6f50b86a3d040df00
Signed-off-by: Automerger Merge Worker <[email protected]>