Dirac HD support

Change-Id: I66d3db165479ba415d8feff21ce29a33b161cc26

Conflicts:
	res/values/cr_strings.xml
	src/com/bel/android/dspmanager/service/HeadsetService.java

Ported from cm-11.0 branch to cm-12.0 by @alviteri & @cristianomatos
Block DiracHD seekbar if not enabled