* added documentation why and when we need the software based prescaler
* implement audiohw_set_bass and audiohw_set_treble for mas35xx
* clean up sound_set_bass and sound_set_treble
* simplify some #ifdef logic
* fix special handling of WM8751 - looking for tester :)
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17274 a1c6a512-1295-4272-9138-f99709370657
* add mas35xx driver for all mas35xx targets. Later
mas35xx code from sound.c will move to this new driver
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13464 a1c6a512-1295-4272-9138-f99709370657