Add bp-based disting of android stubs

This used to be done in Make, but with bp-based dist now supporting
tags we can convert these java_library { hostdex: true } libraries
to dist their classes.jar rather than dex jar.

Bug: 161214753
Test: diff results of `m sdk dist`
Merged-In: Id54507e297b5c57d1ce58f14eb347e7661a5328d
Change-Id: Id54507e297b5c57d1ce58f14eb347e7661a5328d
diff --git a/services/Android.bp b/services/Android.bp
index dc948e9..a8c155c 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -140,10 +140,14 @@
 
 java_library {
     name: "android_system_server_stubs_current",
+    defaults: ["android_stubs_dists_default"],
     srcs: [":services-stubs.sources"],
     installable: false,
     static_libs: ["android_module_lib_stubs_current"],
     sdk_version: "none",
     system_modules: "none",
     java_version: "1.8",
+    dist: {
+        dir: "apistubs/android/system-server",
+    },
 }