Add radio_prop for system app.

Allow Settings to access to persist.radio.enable_tel_mon
Adding TelephonyMonitor Switch in Settings Developer Options.

Bug:35206589
Change-Id: I8beffcf588851df58e9df910ffe856e4f9b5f348
diff --git a/sepolicy/system_app.te b/sepolicy/system_app.te
index b2da4a6..34b24bb 100644
--- a/sepolicy/system_app.te
+++ b/sepolicy/system_app.te
@@ -3,6 +3,7 @@
 allow system_app cne_service:service_manager add;
 allow system_app time:unix_stream_socket connectto;
 get_prop(system_app, hw_sku_prop);
+set_prop(system_app, radio_prop)
 r_dir_file(system_app, sysfs_msm_subsys)
 userdebug_or_eng(`
   allow system_app ramdump_data_file:dir r_dir_perms;