m68k/pci: Drop useless pcibios_setup()

The PCI core supplies a weak pcibios_setup() implementation that is
identical to the m68k implementation.  Remove the m68k version since it is
unnecessary.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>

arch/m68k/kernel/pcibios.c

@@ -92,9 +92,3 @@ void pcibios_fixup_bus(struct pci_bus *bus)
 		pci_write_config_byte(dev, PCI_LATENCY_TIMER, 32);
 	}
 }
-
-char *pcibios_setup(char *str)
-{
-	return str;
-}
-