spapr: Add DRC release method
At the moment, spapr_drc_release() has an ugly switch on the DRC type to call the right, device-specific release function. This cleans it up by doing that via a proper QOM method. It's still arguably an abstraction violation for the DRC code to call into the specific device code, but one mess at a time. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Reviewed-by: NGreg Kurz <groug@kaod.org>
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