[alsa-devel] [RFC PATCH] Fixup automute for Realtek auto parser

The ~6 months old functionality for configurable automuting is broken for the case that the user has only HP and LO (no speakers) - basically there is an "Automute mode" control, but enabling it does nothing. While fixing that, I also took the liberty of refactoring/rewriting some of that code, in order to make it easier to understand and maintain.

Takashi, given you approve/like these changes, I'll go ahead and fix up the quirk files to fit the new variable names.