rild: move to enforcing

Move the rild domain into SELinux enforcing mode. This will
start enforcing SELinux rules; security policy violations will
return EPERM.

Change-Id: Iadb51616ecf6f56148ce076d47f04511810de94c

rild.te

 # rild - radio interface layer daemon
 type rild, domain;
-permissive_or_unconfined(rild)
 type rild_exec, exec_type, file_type;
 
 init_daemon_domain(rild)