Rename package to android.icu.* instead of com.android.ibm.icu.*.

Based on a discussion with the icu team.

Change-Id: I47a6b260a9348debd65282794996f7976b8bc008
diff --git a/jarjar-rules.txt b/jarjar-rules.txt
index 4f0e036..b2da6eb 100644
--- a/jarjar-rules.txt
+++ b/jarjar-rules.txt
@@ -1 +1 @@
-rule com.ibm.icu.** com.android.ibm.icu.@1
+rule com.ibm.icu.** android.icu.@1