parisc: Initialize PCI bridge cache line and default latency

PCI controllers and pci-pci bridges may have not been fully initialized
regarding cache line and defaul latency.

This partly reverts
commit 5f0e9b4 ("parisc: Remove unused pcibios_init_bus()")

Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/include/asm/pci.h b/arch/parisc/include/asm/pci.h
index 71889ea..89c53bf 100644
--- a/arch/parisc/include/asm/pci.h
+++ b/arch/parisc/include/asm/pci.h
@@ -167,6 +167,7 @@
 {
 }
 #endif
+extern void pcibios_init_bridge(struct pci_dev *);
 
 /*
  * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()