disable multithreaded dexopt on all builds?

(to see how it affects stuff)

common: Disable multithreaded dextop on RELEASE and SNAPSHOT builds

This needs some more work before it can be considered stable enough
for use on these builds.

Change-Id: Ic80603cc59623da878875e40de92bda5caef3331
m4: kill until call audio restored

Change-Id: I0cf3393be83a59cabc83b935d035912dc8f880e3