Allow VrCore to access tango calibration file

Bug: 78638290
Bug: 80530644
Test: VrCore can load device calibration.
Change-Id: I153bbf0dac4d407f30d0de672a09773396537f8c
diff --git a/vrcore/sepolicy_mtc/vrcore_app.te b/vrcore/sepolicy_mtc/vrcore_app.te
index a037610..3dda5f2 100644
--- a/vrcore/sepolicy_mtc/vrcore_app.te
+++ b/vrcore/sepolicy_mtc/vrcore_app.te
@@ -11,3 +11,6 @@
 # allow vrcore to access sensor service
 allow vrcore_app fwk_sensor_hwservice:hwservice_manager find;
 allow vrcore_app sensorservice_service:service_manager find;
+
+# allow vrcore to access /persist/tango/calibration.xml
+r_dir_file(vrcore_app, tango_data_file);
\ No newline at end of file