Add missing permission check to offerNetwork am: 27b011caf2

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

Change-Id: I95d3caea5871aaee7a2a60153054ae0294f501c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>