powerpc/powernv: Fetch PHB bus range from dev-tree
The patch enables fetching bus range from device-tree for the specific PHB. If we can't get that from device-tree, the default range [0 255] will be used. Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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