Revert "Removed the DSP LLE on separate thread option."

This reverts commit 2140ac15e45ef3f555d426fc3ee65e7d76251933.

Conflicts:
	Source/Core/Core/HW/DSPLLE/DSPLLE.cpp
Zelda HLE: Introduce behavior flags to handle UCode version differences.

MAKE_DOLBY_LOUDER solves some of the volume issues that were happening in Zelda
Twilight Princess and SMG1.