Enable XZ_DEC_ARM64. am: ae88ba8d2a am: 956d6939bf

Original change: https://android-review.googlesource.com/c/platform/external/xz-embedded/+/2982751

Change-Id: If1cdf975b9b335fa9406e2d70e63942c8446001b
Signed-off-by: Automerger Merge Worker <[email protected]>