Add module_lib and system-server artifacts to sdk dist

Makes these artifacts available for the update_prebuilts script.

Bug: 149293194
Test: m win_sdk dist && find out/dist -type f
Change-Id: Ia1064e50e987433e5e308527c6770ba2d3e8bde3
diff --git a/services/Android.bp b/services/Android.bp
index 024155d..490481c 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -116,6 +116,7 @@
     name: "services-stubs.sources",
     srcs: [":services-all-sources"],
     installable: false,
+    api_tag_name: "SYSTEM_SERVER",
     args: " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.SYSTEM_SERVER\\)" +
         " --hide-annotation android.annotation.Hide" +
         " --hide InternalClasses" + // com.android.* classes are okay in this interface