Merge "libbinder_rs: Add support for attributes to declare_binder_enum" am: 7ad74670a2 am: 38c4a8de07

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1869740

Change-Id: Ib626a3e1ad7a0a701d0e3b8dcc3dae7acb105546