powerpc/85xx: mpc85xx_ds: Simplify mpc85xx_exclude_device() function

Function mpc85xx_exclude_device() is installed and used only when
pci_with_uli is fsl_pci_primary. So replace check for pci_with_uli by
fsl_pci_primary in mpc85xx_exclude_device() and move pci_with_uli variable
declaration into function mpc85xx_ds_uli_init() where it is used.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230409000812.18904-3-pali@kernel.org

arch/powerpc/platforms/85xx/mpc85xx_ds.c

@@ -108,12 +108,10 @@ void __init mpc85xx_ds_pic_init(void)
 }
 
 #ifdef CONFIG_PCI
-static struct device_node *pci_with_uli;
-
 static int mpc85xx_exclude_device(struct pci_controller *hose,
 				   u_char bus, u_char devfn)
 {
-	if (hose->dn == pci_with_uli)
+	if (hose->dn == fsl_pci_primary)
 		return uli_exclude_device(hose, bus, devfn);
 
 	return PCIBIOS_SUCCESSFUL;
@@ -124,6 +122,7 @@ static void __init mpc85xx_ds_uli_init(void)
 {
 #ifdef CONFIG_PCI
 	struct device_node *node;
+	struct device_node *pci_with_uli;
 
 	/* See if we have a ULI under the primary */