[automerger skipped] Revert "[Thread] add Android.bp for Thread flags" am: 2d238dd7f9 -s ours am: 0d1e78a868 -s ours

am skip reason: Merged-In I88c993680976d2e10d672bfdbf45119f2db13868 with SHA-1 da8fac1edb is already in history. Merged-In was found from reverted change.

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2926173

Change-Id: Ia95d4d82e04f8179135ef2c370ad6365334ead76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>