Fix /cache permissions for the dexopt cache

Change-Id: Ibbecac2b5a89d7fa7fb09c5be1d2bc3db766f885
Create /cache/dalvik-cache

manually imported commit ba422208f99552f12f34e6f28cc44445f0e6d9e0 by ctso

Change-Id: I617573a14a8cf08d353804016b3351186720d199

Conflicts:
	rootdir/init.rc