Upgrade xz-embedded to 1b6defd544914bfb4065e343296e5db64ef400e6 am: e6dca0f520

Original change: https://android-review.googlesource.com/c/platform/external/xz-embedded/+/2976973

Change-Id: Ia2a0539247a082cebd1bc2681854f86ac2386cdf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>