[PATCH] powerpc: Extended PCI config space

This adds back the call to pci_cfg_space_size() when building the PCI
tree from OF nodes that was commented out due to the function not being
exported by the PCI code. It's now exported, so let's use it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>