ARM: pci: make pcibios_assign_all_busses use pci_has_flag

Convert pcibios_assign_all_busses from a define to inline so platforms can
control this setting.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm/mach-ixp2000/pci.c b/arch/arm/mach-ixp2000/pci.c
index f797c5f..8888ed9 100644
--- a/arch/arm/mach-ixp2000/pci.c
+++ b/arch/arm/mach-ixp2000/pci.c
@@ -196,6 +196,8 @@
 void __init
 ixp2000_pci_preinit(void)
 {
+	pci_set_flags(0);
+
 #ifndef CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO
 	/*
 	 * Configure the PCI unit to properly byteswap I/O transactions,