Add "art-systemserverclasspath-fragment" to ART SDK.

After this change, a prebuilt "art-systemserverclasspath-fragment" will
be generated when a new SDK is built.

Bug: 194150908
Test: m out/soong/.intermediates/art/build/sdk/art-module-sdk/common_os/snapshot/Android.bp
Change-Id: Ice39ad509702fe2c129f9e6782cc2b054ffe389d
diff --git a/build/sdk/Android.bp b/build/sdk/Android.bp
index a777c6b..50a7db7 100644
--- a/build/sdk/Android.bp
+++ b/build/sdk/Android.bp
@@ -98,6 +98,10 @@
                 "art-bootclasspath-fragment",
             ],
 
+            systemserverclasspath_fragments: [
+                "art-systemserverclasspath-fragment",
+            ],
+
             compat_configs: [
                 "libcore-platform-compat-config",
             ],
@@ -122,7 +126,6 @@
 
             java_sdk_libs: [
                 "art.module.public.api",
-                "service-art",
             ],
 
             java_system_modules: [