Add adservices in apex_availble.

We need to build adservices with mdd in static_libs and it requires downloader add adservices to apex_availble property.

Bug: 239230416

Test: mma
Change-Id: I6a1b7325e2f22885a8faac63730722db7d5d0fb3
diff --git a/src/main/Android.bp b/src/main/Android.bp
index 3931372..ceb65d2 100644
--- a/src/main/Android.bp
+++ b/src/main/Android.bp
@@ -57,6 +57,7 @@
     apex_available: [
         "//apex_available:platform",
         "com.android.extservices",
+        "com.android.adservices",
     ],
     visibility: [
         "//external/libtextclassifier:__subpackages__",