If target has HW tone controls but no HW prescaler (non-implemented or
non-existent), audiohw_set_prescaler() should, for now, do nothing.

Change-Id: If1b1a36970dca82fda1c350fbaa4d6ce068a6d32

Yep, nope, not necessary anymore. Just call functions directly.

Change-Id: I21dc35f8d674c2a9c8379b7cebd5613c1f05b5eb

Just one more SNAFU after redoing sound.c. Software bass/treble controls
in the DSP expect .1 dB gain increments but the gains were being set as
1 dB increments because that's what the AUDIOHW_SETTING specifies. Just
x10 the gains given to audiohw_set_bass/treble.

Change-Id: Id5296f93908ec0036a5605d3a60a2cb5eec91bb5

This is going right in since it's long overdue. If anything is goofed,
drop me a line or just tweak it yourself if you know what's wrong. :-)

Make HW/SW codec interface more uniform when emulating HW functionality
on SWCODEC for functions such as "audiohw_set_pitch". The firmware-to-
DSP plumbing is in firmware/drivers/audiohw-swcodec.c. "sound_XXX"
APIs are all in sound.c with none in DSP code any longer.

Reduce number of settings definitions needed by each codec by providing
defaults for common ones like balance, channels and SW tone controls.

Remove need for separate SIM code and tables and add virtual codec header
for hosted targets.

Change-Id: I3f23702bca054fc9bda40f49824ce681bb7f777b