Make the surfaceflinger domain enforcing.

Change-Id: Id6d9a7cabc2fe9c18de10c6e9bc0080cdcd7033d
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

surfaceflinger.te

 # surfaceflinger - display compositor service
 type surfaceflinger, domain;
-permissive_or_unconfined(surfaceflinger)
 type surfaceflinger_exec, exec_type, file_type;
 
 init_daemon_domain(surfaceflinger)