Revert "redbull: update BOARD_API_LEVEL to T" am: ecd9d22132 am: dab4e08530

Original change: https://googleplex-android-review.googlesource.com/c/device/google/redbull/+/22788402

Change-Id: Iebcf423e8fa91957fd28a6b62cde01b2f9536b5c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>