volume scaling/setting cleanup:

* MAX_VOLUME_255 has been defined for ages.  remove this define
and the code that was only being used when this wasn't defined.
* remove azalia_generic_mixer_{max,validate_value} since they
are pointless.
* when setting both stereo channels to the same level, just set
the right channel level to the left channel level instead of
calculating both separately.

from Alexey Suslikov

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