This might be a similar issue: vmware - Virtualized OSX can't see iPhone device - Super User.
El Capitan seems to have introduced a new USB handling system which could be the cause of the problem.
They suggest to switch from USB 3.0 to USB 2.0, but you said that did not work for you, so I'm sorry.
However, maybe this will help the developers to find the cause and to build a workaround.
Best regards--