RESTRICT AUTOMERGE: Update libxml2 to 2.9.8 Merge to pi-dev and restore Android.mk Bug: 79662501 Bug: 36809766 Bug: 36810305 Bug: 62151041 Test: manually verify functionality for regression Change-Id: Ife351c91c932eb92992656f8ea5c08724a220306 (cherry picked from commit 4e91cfdbb1a8624e5cd5a850d6e17da11d1e34a8)