Add telephony country code to Thread country code sources am: a00bb3fad9 am: 83f727132b

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

Change-Id: If36bfb48d23bc831373b02eaab4ad6e2df9fcfb9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>