bionic-unit-tests should depend on libandroidicu instead

bionic has been moved to use libandroidicu instead of libicuuc.
This CL updates the unit test

Bug: 120659668
Test: m bionic-unit-tests && adb push out/target/product/walleye/data/nativetest/* /data/nativetest && adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests
Change-Id: I59a0589d18bfd6753215dc07874f3c472bd64cca