Add telephony country code to Thread country code sources am: a00bb3fad9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2884948

Change-Id: Ib5bb374826b5f23a452843c17775fa7700822e78
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>