Use ICU in libandroidicu

libicuuc and libicui18n are moved into APEX, but
they have no stable ABI due to the version suffix.

Use libandroidicu which provides stable symbol.
See http://go/apex-stable-icu4c-interface for the design.
See http://aosp/801855 for libandroidicu implementation.

Bug: 117094880
Test: m checkbuild
Test: atest FrameworksWifiTests
Change-Id: I428b28bb34def2880e038df8cf7d6060d3781eac
1 file changed