Merge "[Thread] add config_thread_mdns_vendor_specific_txts" into main am: 9365e728e5

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3143917

Change-Id: I92573c1ce2d3338614395f4d7632c679cb349670
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>