Currently for dwc3_usb31 controller, if maximum_speed is limited to
super-speed in DT, then device mode is limited to SS, but host mode
still works in SSP.

The documentation for max-speed property is as follows:

"Tells USB controllers we want to work up to a certain speed.
Incase  this isn't passed via DT, USB controllers should default to
their maximum HW capability."

It doesn't specify that the property is only for device mode.
There are cases where we need to limit the host's maximum speed to
SuperSpeed only. Use this property for host mode to contrain host's
speed to SuperSpeed.

Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20231219041559.15789-1-quic_kriskura@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 320619105
(cherry picked from commit 91736d06 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Change-Id: I458fa5cd44c1510a797f824e263eb3ea27bbb287
Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>