Merge "[Thread] add Android.bp for Thread flags" into main am: e19a753182

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2900567

Change-Id: Icfa9f0a39b063a73fd2f31d6417c322b223d355a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>