Clear calling identity before accessing DeviceConfig am: afda1a5579 am: 651f10b65d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2584072

Change-Id: I0cbd380a6a5688ccb92031adfaf4ebca452aae40
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>