pci: display header for bus scan

If we are displaying detected PCI devices (CONFIG_PCI_SCAN_SHOW) display
a 'PCI:' header prior to scan.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

drivers/pci/pci.c

@@ -503,6 +503,10 @@ int pci_hose_scan(struct pci_controller *hose)
 	}
 #endif /* CONFIG_PCI_BOOTDELAY */
 
+#ifdef CONFIG_PCI_SCAN_SHOW
+	puts("PCI:\n");
+#endif
+
 	/*
 	 * Start scan at current_busno.
 	 * PCIe will start scan at first_busno+1.