Add missing permission check to offerNetwork am: 27b011caf2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/31944104

Change-Id: I1636db1282c717d615f16447106dac90e92d8ed1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>