powerpc/opal: Add PHB to cxl mode call
This adds the OPAL call to change a PHB into cxl mode. Signed-off-by: NIan Munsie <imunsie@au1.ibm.com> Signed-off-by: NMichael Neuling <mikey@neuling.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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