Revert "xhci: plat: Register shutdown for xhci_plat"

This reverts commit b07c12517f2aed0add8ce18146bb426b14099392

It is incomplete and causes hangs on devices when shutting down. It
needs a much more "complete" fix in order to work properly. As that fix
has not been merged, revert this patch for now before it causes any more
problems.

Cc: Greg Hackmann <[e-mail]>
Cc: Adam Wallis <[e-mail]>
Cc: Mathias Nyman <[e-mail]>
Cc: stable <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/xhci-plat.c

···
 static struct platform_driver usb_xhci_driver = {
 	.probe	= xhci_plat_probe,
 	.remove	= xhci_plat_remove,
-	.shutdown	= usb_hcd_platform_shutdown,
 	.driver	= {
 		.name = "xhci-hcd",
 		.pm = &xhci_plat_pm_ops,