PCI: endpoint: Replace magic number '6' by PCI_STD_NUM_BARS

Replace the constant "6" by PCI_STD_NUM_BARS, as defined in
include/uapi/linux/pci_regs.h:

  #define PCI_STD_NUM_BARS       6       /* Number of standard BARs */

Link: https://lore.kernel.org/r/20241212162547.225880-1-rick.wertenbroek@gmail.com
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Author: rwk-git

include/linux/pci-epf.h

@@ -157,7 +157,7 @@ struct pci_epf {
 	struct device		dev;
 	const char		*name;
 	struct pci_epf_header	*header;
-	struct pci_epf_bar	bar[6];
+	struct pci_epf_bar	bar[PCI_STD_NUM_BARS];
 	u8			msi_interrupts;
 	u16			msix_interrupts;
 	u8			func_no;
@@ -174,7 +174,7 @@ struct pci_epf {
 	/* Below members are to attach secondary EPC to an endpoint function */
 	struct pci_epc		*sec_epc;
 	struct list_head	sec_epc_list;
-	struct pci_epf_bar	sec_epc_bar[6];
+	struct pci_epf_bar	sec_epc_bar[PCI_STD_NUM_BARS];
 	u8			sec_epc_func_no;
 	struct config_group	*group;
 	unsigned int		is_bound;