Add the com.android.art to the sdk instead of *fragments

Dedup the *fragments properties of com.android.art and art-module-sdk.

Bug: 232401814
Test: m art-module-sdk
      - ran above with and without this change, no changes in zip.
      - also ran above after removing apexes and *fragments and
        compared and the *fragments were missing.
Change-Id: I350a11908f2406eb8955cad6ce5ad242cef24195
diff --git a/build/sdk/Android.bp b/build/sdk/Android.bp
index a9ee675..9cafb8a 100644
--- a/build/sdk/Android.bp
+++ b/build/sdk/Android.bp
@@ -93,13 +93,10 @@
         },
 
         android: {
-            bootclasspath_fragments: [
-                // Adds the fragment and its contents to the sdk.
-                "art-bootclasspath-fragment",
-            ],
-
-            systemserverclasspath_fragments: [
-                "art-systemserverclasspath-fragment",
+            apexes: [
+                // Adds exportable dependencies of the API to the sdk,
+                // e.g. *classpath_fragments.
+                "com.android.art",
             ],
 
             compat_configs: [