Add ICU as a java library for docs.

Change-Id: Ifd5f0a076e2cbdf0498c209c916d5a55aa12f0ce
diff --git a/Android.mk b/Android.mk
index c12f74a..9bfbab5 100644
--- a/Android.mk
+++ b/Android.mk
@@ -680,6 +680,7 @@
 	bouncycastle \
 	okhttp \
 	ext \
+	icu4j \
 	framework \
 	telephony-common \
 	voip-common