Revert "[devhost] Wait for BindDriver in reply to Bind"

This reverts commit cf254ae8.

Reason for revert: Causes vim2 to fail to pave. See: https://fuchsia.atlassian.net/browse/DNO-519

Original change's description:
> [devhost] Wait for BindDriver in reply to Bind
> 
> Calls to fuchsia.device.Controller/Bind should only return once the
> operation completes, which is when
> fuchsia.device.manager.DeviceController/BindDriver is called.
> 
> ZX-3991 #done
> 
> Change-Id: I10607640072c8f779ac1d5be79d5a2da6de6288b

TBR=kulakowski@google.com,teisenbe@google.com,abdulla@google.com,brettw@google.com

Change-Id: I370d03abd9fa93a70a48f86f4df171f2cf87ee12
No-Presubmit: true
No-Tree-Checks: true
No-Try: true