pci: pci_header_show 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

@@ -223,7 +223,7 @@ static struct pci_reg_info regs_cardbus[] = {
  *
  * @dev: Bus+Device+Function number
  */
-void pci_header_show(struct udevice *dev)
+static void pci_header_show(struct udevice *dev)
 {
 	unsigned long class, header_type;