Don't enumerate _DOD for attaching acpivout(4), since:

- ACPI spec. says _DOD is not required for brightness controls,
- The list returned by _DOD might be wrong,
- It's an unnecessary work to do.
Instead, decision to attach will be based on the actual methods
found, similarly like in the other ACPI drivers.
Tested by several on tech@.
OK kettenis@, marco@, pirofti@.

pirofti@ asked me to note here that devices not supporting brightness
controls won't attach from now on.  This shouldn't be a concern for
you, since such devices weren't doing anything at all, anyway.

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