change files in /dev/log/ to 666

With newer Android kernels, anyone can read from the files in
/dev/log. If you're in the logs group (have the READ_LOGS) permission,
you'll see all entries. If you're not in that group, you'll see
log messages associated with your UID.

Relax the permissions on the files in /dev/log/ to allow an application
to read it's own log messages.

Bug: 5748848
Change-Id: Ie740284e96a69567dc73d738117316f938491777