Merge "Add comment explaining why crosvm shouldn't be allowed to open files." am: d020fc05f3 am: 0ae5a68417 am: 9508489a72

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/1925961

Change-Id: Ia8cea576cc80d5dbdc00e53f40308143f847c379