Add initialization behavior to libandroidicu

The first step towards removing the libicuandroid_utils
static library. The static library puts initialization
behavior / path knowledge into various binaries that
also use libandroidicu. Moving the initialization behavior
into the dynamic libandroidicu removes path knowledge
(improving encapsulation) and reduces the library count
by one.

Bug: 120493361
Test: regenerate / build only
Change-Id: I0dff682ab733a23983907f69970ec687cdd8ddac
8 files changed