pci: pciinfo_header can be static

To avoid W=1 build warnings, declare this function as static, since it
is not used outside of this translation module.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

cmd/pci.c

@@ -251,7 +251,7 @@ static void pci_header_show(struct udevice *dev)
     }
 }
 
-void pciinfo_header(int busnum, bool short_listing)
+static void pciinfo_header(int busnum, bool short_listing)
 {
 	printf("Scanning PCI devices on bus %d\n", busnum);