Delete dalvikcache_data_file write/setattr access from shell.

This showed up at some point in the past during our own
internal CTS testing but it seems wrong based on the DAC
permissions and a potential way to inject code into apps
from the shell.  Drop it for now and see if it shows up again.
This predates userdebug/eng vs user shell split so possibly
it only happens in the userdebug/eng case.

Change-Id: If8b1e7817f8efecbf68a0ba5fd06328a23a6c6db
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>