xhci: Move xhci MSI sync function to to xhci-pci

Move function to sync MSI from xhci.c to xhci-pci.c to decouple PCI
specific code from generic xhci code.

No functional changes, function is an exact copy

[commit message rewording -Mathias]

Signed-off-by: Josue David Hernandez Gutierrez <[e-mail]>
Signed-off-by: Mathias Nyman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/xhci-pci.c

···
 	.update_hub_device = xhci_pci_update_hub_device,
 };
 
+static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
+{
+	struct usb_hcd *hcd = xhci_to_hcd(xhci);
+
+	if (hcd->msix_enabled) {
+		struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+		int i;
+
+		for (i = 0; i < xhci->msix_count; i++)
+			synchronize_irq(pci_irq_vector(pdev, i));
+	}
+}
+
 /* Free any IRQs and disable MSI-X */
 static void xhci_cleanup_msix(struct xhci_hcd *xhci)
 {
···
 	writel(reg, hcd->regs + SPARSE_CNTL_ENABLE);
 }
 
-extern void xhci_msix_sync_irqs(struct xhci_hcd *xhci);
 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 {
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);

drivers/usb/host/xhci.c

···
 	return 0;
 }
 
-#ifdef CONFIG_USB_PCI
-
-void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
-{
-	struct usb_hcd *hcd = xhci_to_hcd(xhci);
-
-	if (hcd->msix_enabled) {
-		struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
-		int i;
-
-		for (i = 0; i < xhci->msix_count; i++)
-			synchronize_irq(pci_irq_vector(pdev, i));
-	}
-}
-EXPORT_SYMBOL_GPL(xhci_msix_sync_irqs);
-
-#else
-
-static inline void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
-{
-}
-
-#endif
-
 static void compliance_mode_recovery(struct timer_list *t)
 {
 	struct xhci_hcd *xhci;