powerpc/fsl_pci: Make fsl_add_bridge() static

Since commit 905e75c4 ("powerpc/fsl-pci: Unify pci/pcie initialization code")
fsl_add_bridge() is not used anymore outside of fsl_pci.c

Make it static.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/2115e3597d81e72a865820af54f0e290d0fd2b3a.1692199186.git.christophe.leroy@csgroup.eu

arch/powerpc/sysdev/fsl_pci.c

@@ -519,7 +519,7 @@ void fsl_pcibios_fixup_bus(struct pci_bus *bus)
 	}
 }
 
-int fsl_add_bridge(struct platform_device *pdev, int is_primary)
+static int fsl_add_bridge(struct platform_device *pdev, int is_primary)
 {
 	int len;
 	struct pci_controller *hose;

arch/powerpc/sysdev/fsl_pci.h

@@ -112,7 +112,6 @@ struct ccsr_pci {
 
 };
 
-extern int fsl_add_bridge(struct platform_device *pdev, int is_primary);
 extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
 extern void fsl_pcibios_fixup_phb(struct pci_controller *phb);
 extern int mpc83xx_add_bridge(struct device_node *dev);