Allow artd to scan system_data_file:dir on Wembley. am: 98b7c7f259 am: a8a91310f1

Original change: https://android-review.googlesource.com/c/device/mediatek/wembley-sepolicy/+/2376031

Change-Id: Iadf9cff6cca352ca5fd4f7a698b8214a1c4e4d53
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>