Revert "Hide new public APIs introduced by ICU 60."

This reverts commit 20d1241cf512b778bcb70f80887277ea4ef45753.

This commit effectively exposes new APIs in ICU 60.

Bug: 68208236
Test: make
Test: Run ./generate_android_icu4j.sh and no new change
Merged-In: Icb36064a234b851794d934d2b8c5dfced2da80c0
Change-Id: If3381e8eff16bea49798db7362e55a05e5b5278c
10 files changed