Merge "[Thread] add country code overlay to enable/disable setting Thread country code" into main am: adb71602c5

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3545881

Change-Id: Ieac083244fe1236872d7d88c9a0b1fde6db13c63
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>