Allow linking to libicuuc.so and libicui18n.so from executable in /data

Executable in /data/ runs in default linker namespace, not
classloader namespace.
In Q, we moved libicuuc.so and libicui18n into the runtime
namespace, and allow linking from runtime namespace and classloader
namespace.

This change further allows linking from default namespace, and tries
to fix the regression temporarily.

Bug: 130788466
Test: The app issue is fixed after this CL
Change-Id: Ifae52b554124514e433cfe78875643a7450fbabd