usb: host: xhci: cleanup hcd private size

This patch cleanups the hcd private size to suitable size.
The previous code has "sizeof(struct xhci_hcd *)" in xhci_hc_driver
as hcd_priv_size and sizeof(struct xhci_hcd) in xhci_plat_overrides
or xhci_pci_overrides as extra_priv_size. However, the xhci driver
uses a "sizeof(struct xhcd_hcd)" memory space in each hcd
(main_hcd and shared_hcd) actually.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci.c

@@ -4952,7 +4952,7 @@ EXPORT_SYMBOL_GPL(xhci_gen_setup);
 static const struct hc_driver xhci_hc_driver = {
 	.description =		"xhci-hcd",
 	.product_desc =		"xHCI Host Controller",
-	.hcd_priv_size =	sizeof(struct xhci_hcd *),
+	.hcd_priv_size =	sizeof(struct xhci_hcd),
 
 	/*
 	 * generic hardware linkage