Merge "Remove ULocale#getRegionForSupplementalData(ULocale,boolean) from @IntraCoreApi" am: d0e0921e88

Original change: https://android-review.googlesource.com/c/platform/external/icu/+/1518123

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I23c10e4966aadf9ec2dc21eb6bb493e8f0f3514e