xhci: tegra: Fix ghost USB device on dual-role port unplug

xhci: tegra: Fix ghost USB device on dual-role port unplug

When a USB device is unplugged from the dual-role port, the device-mode
path in tegra_xhci_id_work() explicitly clears both SS and HS port power
via direct hub_control ClearPortFeature(POWER) calls. This preempts the
xHCI controller's normal disconnect processing -- PORT_CSC is never
generated, the USB core never sees the disconnect, and the device remains
in its internal tree as a ghost visible in lsusb.

Add an otg_set_port_power flag to control whether the dual-role switch
path performs explicit port power management. SoCs that need it
(Tegra124 / Tegra210 / Tegra186) set the flag; later SoCs (Tegra194 and
beyond) rely on the PHY mode change to handle disconnect naturally and
skip all port power calls.

Within the port power path, otg_reset_sspi additionally gates the SSPI
reset sequence on host-mode entry for SoCs that require it.

Flags set per SoC:
  Tegra124, Tegra186  -> otg_set_port_power
  Tegra210            -> otg_set_port_power, otg_reset_sspi
  Tegra194 and later  -> (none)

Fixes: f836e7843036 ("usb: xhci-tegra: Add OTG support")
Cc: stable <stable@kernel.org>
Signed-off-by: Wei-Cheng Chen <weichengc@nvidia.com>
Link: https://patch.msgid.link/20260505112630.217704-1-weichengc@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>