MusicFX: introduce MusicFX

If MusicFX is enabled, dsp must not build
but dsp must be enabled for all other devices.

Change-Id: Ic9d039f480a60f970b1b6b8d3ace0fb10de53c29
MusicFX: fix ifneq statement

Change-Id: I0e65e66afd207e82b3f2aac3d7af78ace274fb3f
Merge remote-tracking branch 'upstream/kk' into fjkk