drm/nouveau/acpi: ensure matching ACPI handle and supported functions
Ensure that the returned set of supported DSM functions (MUX, Optimus)
match the ACPI handle that is set in nouveau_dsm_pci_probe.
As there are no machines with a MUX function on just one PCI device and
an Optimus on another, there should not be a functional impact. This
change however makes this implicit assumption more obvious.
Convert int to bool and rename has_dsm to has_mux while at it. Let the
caller set nouveau_dsm_priv.dhandle as needed.
v2: pass dhandle to the caller.
Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Peter Wu <peter@lekensteyn.nl> Acked-by: Dave Airlie <airlied@redhat.com Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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