[automerger skipped] [Thread] add Android.bp for Thread flags am: a59a6e304b -s ours

am skip reason: Merged-In I88c993680976d2e10d672bfdbf45119f2db13868 with SHA-1 da8fac1edb is already in history

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

Change-Id: If24f9192c4908e24931ac8f7268d9c71ff66aa24
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>