tuna: dexopt /system apps to /cache

Change-Id: Ia1c3b2fe6426c6623d82b787614919a3dde0aa87
Revert "tuna: dexopt /system apps to /cache"

This reverts commit 0836920f4372a70806c9c69cd966e985cf29670d.

Change-Id: Ic6531596513e958cccbeef787bdd139b77610d66
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0