bluetooth_test_with_timerfd: Drop alarm reference within callback am: 8724c3a6 am: 58bc84e6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3059763



Change-Id: Ibcc51d89b373c2a8be1d15fb522b2c26f420a55d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>