drivers/of: Export OF changeset functions
The PowerNV PCI hotplug driver is going to use the OF changeset to manage the changed device sub-tree. This exports those OF changeset functions for that. Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com> Acked-by: NWolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: NWolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: NRob Herring <robh@kernel.org>
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