Clear calling identity before accessing DeviceConfig am: d65aa4ba26 am: b0edbee0f6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23160915

Change-Id: I1d6847a79154d3febc6e81e550f4d4f5eb9bc0c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>