Revert "don't use /cache/dalvik-cache for now"

This reverts commit 264cf27057ec70ab77131048aac51685d67e6f5d.

Change-Id: If5f61e307d05d7c772fbd19fd82dfa6c0d6f2f8a
Merge "Revert "don't use /cache/dalvik-cache for now"" into kitkat