Robolectric: Use jarjar'ed icu4j-icu{tz,}data directly.

robolectric_android-all-stub was carrying jarjar rules, even
though those only affected the icu4j-{tz,}icudata parts of
the target.

This CL switches to the dependency to the already-jarjar'ed
icu4j-icu{tz,}data-jarjar targets, which is better isolated and
may be built with an earlier LOCAL_JAVA_LANGUAGE_VERSION.

Bug: 72703434
Test: Treehugger (after http://r.android.com/c/612671 )

Change-Id: I56649cd31687159f5035b89a98677bd8c1a6a169
diff --git a/Android.mk b/Android.mk
index e10a3f5..352b94a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -18,16 +18,13 @@
 LOCAL_MODULE := robolectric_android-all
 LOCAL_JACK_ENABLED := disabled
 
-# Re-package icudata under android.icu.**.
-LOCAL_JARJAR_RULES := external/icu/icu4j/liblayout-jarjar-rules.txt
-
 LOCAL_STATIC_JAVA_LIBRARIES := \
     conscrypt \
     core-libart \
     ext \
     framework \
-    icu4j-icudata \
-    icu4j-icutzdata \
+    icu4j-icudata-jarjar \
+    icu4j-icutzdata-jarjar \
     ims-common \
     legacy-test \
     libphonenumber-platform \