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.

Bug: 117094880
Test: m
Merged-In: Ibfb19d5dbc515c798fc15adadac8884f7068d5fa
Change-Id: Ibfb19d5dbc515c798fc15adadac8884f7068d5fa
diff --git a/Android.bp b/Android.bp
index cc327af..344e6ee 100644
--- a/Android.bp
+++ b/Android.bp
@@ -56,8 +56,7 @@
     ],
 
     shared_libs: [
-        "libicuuc",
-        "libicui18n",
+        "libandroidicu",
     ],
 
     cflags: [