Extract jar-sorting to be accessible to soong_zip

Bug: 64536066
Test: m -j # which runs unit tests
Change-Id: I4830bd331c9dab0b1d300a18aefaf25a6af4cfdc
diff --git a/Android.bp b/Android.bp
index d1b8f00..cc28c98 100644
--- a/Android.bp
+++ b/Android.bp
@@ -4,6 +4,7 @@
     "cmd/*",
     "fs",
     "finder",
+    "jar",
     "third_party/zip",
     "ui/*",
 ]