Merge "Set TZDEFAULT to NULL." am: 9465700983

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2101267

Change-Id: I7a0ee6a032366d01f0f14d7adef40b6bd9a2ebbb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>