This reverts commit a309ee6e

.

This isn't in line with the usb specification and adds regressions,
win7 fails to drive the usb hub for example.

Was added because it "solved" the issue of hubs interacting badly
with the xhci host controller.  Now with the root cause being fixed
in xhci (commit <FIXME>) we can revert this one.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>