Part of media security hardening
MediaDrm was temporarily allowed to
run in either mediaserver or mediadrmserver
while all nexus devices were implementing
support for the native_handle representation
of secure buffers. Now that all nexus
devices support native_handle, the MediaDrm
stack can be removed from mediaserver.
b/22990512
Change-Id: I96a5222f94cd1580ac411de5b48beb44b99cc8d7
d12b7c0600