dragonboard: sepolicy: Add sepolicy rules to fix problems seen adb remount overlays am: a58e74ea06 am: 2372d29d25 am: dc2dc122dc am: e49a40f4f1

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2063214

Change-Id: Idb117492bc1f58d27452a9a80cbc3e7121b835e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>