powerpc/pci: export pcibios_free_controller()
Export pcibios_free_controller(), so it can be used by the cxl module to free virtual PHBs. Signed-off-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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