dscpPolicy: lock down bpf cache map am: 1ec8d7df58

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3254254

Change-Id: I111f68b90a9514d7c48baa93f3d0346037ad7cf3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>