this is the _URB_ transfer type - which is different from the
transfer type in the endpoint descriptor

Change-Id: I9e23d9825efb30311cd3e04d01548c03b163c276
Reviewed-on: https://code.wireshark.org/review/3299
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
defines for endpoint transfer types

Change-Id: Iffd5d81dde15eba12511dc89664d7ea06a70436f
Reviewed-on: https://code.wireshark.org/review/3300
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>