Remove __ANDROID_API__ >= 31 guard am: 75f20ebb72

Original change: https://android-review.googlesource.com/c/platform/external/icu/+/1583823

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I77f3495aec9a6a1f3a3d4dabe21d20ea7b9da19b