remove unnecessary property from libapexd

We don't need to set generated_headers to use xsd_config if what we need
is only its implemetation and we don't re-export the headers.

Bug: n/a
Test: m apexd
Change-Id: Ie3938ea4d74cf1ee6c701bf26073959892f04b35
diff --git a/apexd/Android.bp b/apexd/Android.bp
index 2794a04..ec602b8 100644
--- a/apexd/Android.bp
+++ b/apexd/Android.bp
@@ -153,7 +153,6 @@
   ],
   export_include_dirs: ["."],
   generated_sources: ["apex-info-list"],
-  generated_headers: ["apex-info-list"],
   // Don't add shared/static libs here; add to libapexd_defaults instead.
 }