powerpc/PCI: make pci_probe_only default to 0

pci_probe_only is set on ppc64 to prevent resource re-allocation
by the core. It's meant to be used in very specific circumstances
such as when operating under a hypervisor that may prevent such
re-allocation.

Instead of default to 1, we make it default to 0 and explicitly
set it in the few cases where we need it.

This fixes FSL PCI which wants it clear among others.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/powerpc/platforms/pseries/setup.c

@@ -380,6 +380,9 @@ static void __init pSeries_setup_arch(void)
 
 	fwnmi_init();
 
+	/* By default, only probe PCI (can be overriden by rtas_pci */
+	pci_probe_only = 1;
+
 	/* Find and initialize PCI host bridges */
 	init_pci_config_tokens();
 	find_and_init_phbs();