Revert "redbull: update BOARD_API_LEVEL to T" am: ecd9d22132 am: 66e7f3f4f7 am: 8f5032fc95

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

Change-Id: I338d0353bd1631a01fbcec2fb9eedcba593e9805
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>