dscpPolicy: lock down bpf cache map am: 1ec8d7df58 am: 0d7b785b43

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

Change-Id: Idfab310cdc2ced0428a0db62d339149df628adf6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>