Revert "tuna: dexopt /system apps to /cache"

This reverts commit 0836920f4372a70806c9c69cd966e985cf29670d.

Change-Id: Ic6531596513e958cccbeef787bdd139b77610d66
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_samsung_tuna into kk_mkt