veyron2/vdl: Remove generated dead code
veyron2/vdl: Remove generated dead code

veyron2.Runtime does not implement ipc.BindOpt, so the generated Bind<Service>
methods should not be concerned with handling it.

Change-Id: I367b2965f25e15b13dd997460bf5c64e890e714d

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref