Add Randon Tweaks

- random: entropy tweaks are all the rage nowadays

use nonblocking for all.  Read this web page:
http://lwn.net/Articles/489734/

Change-Id: I04f10062abb525006e16a9a03e97797995be4a83

- random: prevent add_input from doing anything
update to 3.0.75
 Nexus Kernel R3