RESTRICT AUTOMERGE Update Android to tzdb 2020b [R] am: 2ec0d0fbb2 am: 9516d6ebec

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/icu/+/12977935

Change-Id: Ida19f5e6e873591ec90585b3d65f9cc9a96349fd