Fix the following missing-prototypes build warning:
arch/mips/pci/pci-lantiq.c:239:12: error: no previous prototype for 'pcibios_init' [-Werror=missing-prototypes]
239 | int __init pcibios_init(void)
| ^~~~~~~~~~~~
Signed-off-by: Shiji Yang <yangshiji66@outlook.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>