xhci: remove xhci_check_usb2_port_capability helper

This helper was only called from one function.
Removing it both reduces lines of code and made it more readable.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240429140245.3955523-3-mathias.nyman@linux.intel.com


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