Merge "Gray out the network mode UI before the carrier config is ready" into tm-dev am: 564c8848

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/17903598



Change-Id: I91a231d6c86a2f594feb5eb9604653247273e6ae
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>