Revert "dt-bindings: usb: Add bindings for multiport properties on DWC3 controller"

This reverts commit eb3f1d9e.

The patches for the features that these bindings described are still
under active development, so odds are these bindings will also have to
be changed in the future.  As no in-tree code requires these bindings at
the moment, revert them.

Reported-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/ZTeObdjSSok0tttg@hovoldconsulting.com


Cc: Bjorn Andersson <quic_bjorande@quicinc.com>
Cc: Krishna Kurapati <quic_kriskura@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>