Disable example codec2-service by default

`android.hardware.media.c2@1.1-default-service` is an example codec2
service, developers who wish to implement codec2 can use this code as a
skeleton.
`android.hardware.media.c2@1.1-default-service` is not to be used
directly without customization. Mark it as "enabled: false" so it
wouldn't affect build.

Bug: 159780061
Test: TH
Change-Id: I61f2d50dd9279981fb78af8c1ac76e00f9ad8487
diff --git a/media/codec2/hidl/services/Android.bp b/media/codec2/hidl/services/Android.bp
index a16b106..3780a5a 100644
--- a/media/codec2/hidl/services/Android.bp
+++ b/media/codec2/hidl/services/Android.bp
@@ -52,6 +52,9 @@
     // directly in the main device manifest.xml file or via vintf_fragments.
     // (Remove the line below if the entry is already in the main manifest.)
     vintf_fragments: ["manifest_media_c2_V1_1_default.xml"],
+
+    // Remove this line to enable this module.
+    enabled: false,
 }
 
 // seccomp policy file.