Address system_server denials.

Label /proc/sysrq-trigger and allow access.
Label /dev/socket/mtpd and allow access.

Resolves denials such as:
avc:  denied  { getattr } for  pid=12114 comm="Binder_2" path="socket:[219779]" dev="sockfs" ino=219779 scontext=u:r:untrusted_app:s0 tcontext=u:r:system_server:s0 tclass=tcp_socket

avc:  denied  { call } for  pid=1007 comm="Binder_8" scontext=u:r:system_server:s0 tcontext=u:r:su:s0 tclass=binder

avc:  denied  { write } for  pid=1024 comm="watchdog" name="sysrq-trigger" dev="proc" ino=4026533682 scontext=u:r:system_server:s0 tcontext=u:object_r:proc:s0 tclass=file

avc:  denied  { write } for  pid=11567 comm="LegacyVpnRunner" name="mtpd" dev="tmpfs" ino=36627 scontext=u:r:system_server:s0 tcontext=u:object_r:socket_device:s0 tclass=sock_file

avc:  denied  { ptrace } for  pid=10924 comm=5369676E616C2043617463686572 scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=process

avc:  denied  { sigkill } for  pid=26077 comm="NativeCrashRepo" scontext=u:r:system_server:s0 tcontext=u:r:zygote:s0 tclass=process

avc:  denied  { write } for  pid=1024 comm="android.bg" scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=netlink_socket

avc:  denied  { getattr } for  pid=473 comm="FinalizerDaemon" path="socket:[11467]" dev="sockfs" ino=11467 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=tcp_socket

avc:  denied  { getattr } for  pid=473 comm="FinalizerDaemon" path="socket:[12076]" dev="sockfs" ino=12076 scontext=u:r:system_server:s0 tcontext=u:r:mediaserv
er:s0 tclass=udp_socket

avc:  denied  { getopt } for  pid=473 comm="FinalizerDaemon" laddr=192.168.159.172 lport=51576 faddr=93.127.173.40 fport=554 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=tcp_socket

avc:  denied  { getopt } for  pid=473 comm="FinalizerDaemon" lport=15658 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=udp_socket

avc:  denied  { read write } for  pid=21384 comm="rtsp" path="socket:[443742]"
dev="sockfs" ino=443742 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s
0 tclass=tcp_socket

avc:  denied  { read write } for  pid=21384 comm="rtsp" path="socket:[444842]" dev="sockfs" ino=444842 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=udp_socket

avc:  denied  { setopt } for  pid=1326 comm="Binder_9" lport=16216 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=udp_socket

avc:  denied  { setopt } for  pid=1676 comm="Binder_6" laddr=192.168.156.130 lport=51044 faddr=74.125.214.81 fport=554 scontext=u:r:system_server:s0 tcontext=u:r:mediaserver:s0 tclass=tcp_socket

avc:  denied  { getattr } for  pid=10915 comm="system_server" path="/dev/mdm" dev="tmpfs" ino=7484 scontext=u:r:system_server:s0 tcontext=u:object_r:radio_device:s0 tclass=chr_file

avc:  denied  { read } for  pid=10915 comm="system_server" name="mdm" dev="tmpfs" ino=7484 scontext=u:r:system_server:s0 tcontext=u:object_r:radio_device:s0 tclass=chr_file

avc:  denied  { unlink } for  pid=14866 comm="system_server" name="wallpaper" dev="mmcblk0p9" ino=285715 scontext=u:r:system_server:s0 tcontext=u:object_r:wallpaper_file:s0 tclass=file

avc:  denied  { getattr } for  pid=12114 comm="Binder_2" path="socket:[219779]" dev="sockfs" ino=219779 scontext=u:r:untrusted_app:s0 tcontext=u:r:system_server:s0 tclass=tcp_socket

avc:  denied  { getopt } for  pid=32300 comm="Binder_1" laddr=::ffff:127.0.0.1 lport=4939 faddr=::ffff:127.0.0.1 fport=53318 scontext=u:r:untrusted_app:s0 tcontext=u:r:system_server:s0 tclass=tcp_socket

avc:  denied  { read write } for  pid=10840 comm="pool-17-thread-" path="socket:[205990]" dev="sockfs" ino=205990 scontext=u:r:untrusted_app:s0 tcontext=u:r:system_server:s0 tclass=tcp_socket

avc:  denied  { write } for  pid=20817 comm="dumpsys" path="/mnt/shell/emulated/0/aupt-output/bugreport-2014-02-22-11-17-16.txt.tmp" dev="fuse" ino=3100784040 scontext=u:r:system_server:s0 tcontext=u:object_r:sdcard_internal:s0 tclass=file

Change-Id: I481ac26667b487031a5d3317b0a028a027a8e641
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>