Merge "binder: RpcTransport: change to size_t." am: 176a33a2b4 am: cc00b4f938 am: 9c7441f58a am: c09e8e79df

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1787187

Change-Id: If37bd239914a1e3e64bef5cbd8e4c4b6225bda1e