Merge "Make libxml2 available to com.android.virt" am: 39b79a220e am: 90db829280 am: 7b8ecf0c22

Original change: https://android-review.googlesource.com/c/platform/external/libxml2/+/1680265

Change-Id: I1eb5879be3e7ac35802748898a1f70da7a34b9d3