device/root_device: Consolidate common _scan_bus() functions

scan_usb_bus() and root_dev_scan_bus() had the very same implementation.
So rename the latter to scan_static_bus() and use that for both cases.

Change-Id: If0aba9c690b23e3716f2d47ff7a8c3e8f6d82679
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31901
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/amd/stoneyridge/usb.c b/src/soc/amd/stoneyridge/usb.c
index 00f8237..3c62191 100644
--- a/src/soc/amd/stoneyridge/usb.c
+++ b/src/soc/amd/stoneyridge/usb.c
@@ -63,7 +63,7 @@
 	.set_resources = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init = set_usb_over_current,
-	.scan_bus = scan_usb_bus,
+	.scan_bus = scan_static_bus,
 	.acpi_name = soc_acpi_name,
 	.ops_pci = &lops_pci,
 };