usb: host: xhci-plat: Use dev_is_pci() helper

Use common dev_is_pci() helper for checking PCI devices.
And if CONFIG_PCI is not defined, dev_is_pci returns false. Therefore,
CONFIG_PCI is also unnecessary, so remove it.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Link: https://lore.kernel.org/r/20230405234605.2310155-1-nobuhiro1.iwamatsu@toshiba.co.jpSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-plat.c

@@ -362,10 +362,8 @@ static int xhci_generic_plat_probe(struct platform_device *pdev)
 		if (is_of_node(sysdev->fwnode) ||
 			is_acpi_device_node(sysdev->fwnode))
 			break;
-#ifdef CONFIG_PCI
-		else if (sysdev->bus == &pci_bus_type)
+		else if (dev_is_pci(sysdev))
 			break;
-#endif
 	}
 
 	if (!sysdev)