Merge "Change robolectric genrule to host variant" am: 67a0c64481 am: 2459a9bd65 am: 5e652d5f72 am: 8380044f45

Original change: https://android-review.googlesource.com/c/platform/system/timezone/+/1367132

Change-Id: I690fb93598f3d36f7cc91794231750334c51e282