sepolicy: Make superuser_device and sudaemon mlstrustedobjects

Address:
avc: denied { write } for pid=8782 comm="su" name="su-daemon" dev="tmpfs" ino=9462
scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:superuser_device:s0
tclass=sock_file permissive=0

avc: denied { connectto } for pid=6666 comm="su" path="/dev/socket/su-daemon/su-daemon"
scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:r:sudaemon:s0
tclass=unix_stream_socket permissive=0

And thus fix su.

Change-Id: I666277067c5ff9f2a985c243075c63fd87090b27