installd: change profile files to 0660

Profiling information leaks data about how people interact
with apps, so we don't want the data to be available
to other apps. Only the app and system_server need access.

Don't create the /data/dalvik-cache/profiles directory. init.rc
does it for us now.

Change-Id: Ic1b44009faa30d704855e97631006c4b990a4ad3