libpayload: Port usb hub driver to use the generic code

This is mostly a rewrite, don't even try to read a diff.

Tested with an internal rate matching hub on a QM77 board and three hubs
integrated into DELL monitors.

Original-Change-Id: Ib12fa2aa90af4e0f37143d2ed92c4a1705b6d774
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3451
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
(cherry picked from commit 5736fab4beb17ea1a04088d1cf16121c57ccf744)

BUG=chrome-os-partner:21969
TEST=None

Change-Id: Idec16258a5b7286de48b5d3974eeefcab45a7e50
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/168096
14 files changed