sm8350-common: sepolicy: Allow camera hal to read mnt_vendor_file

This is necessary to find the dualcamera calibration in persist

Change-Id: I89d5d7839e13aeb2f5373b8bdc2e03830407cfb0

sepolicy/vendor/hal_camera_default.te

@@ -3,3 +3,4 @@ vendor_internal_prop(vendor_camera_sensor_prop)
 
 set_prop(hal_camera_default, vendor_camera_sensor_prop)
 r_dir_file(hal_camera_default, camera_persist_file)
+r_dir_file(hal_camera_default, mnt_vendor_file)