Make sendBroadcast() really asynchronous am: 9519a1e29b am: da03e5dcde

Original change: https://android-review.googlesource.com/c/platform/packages/apps/SecureElement/+/3291561

Change-Id: Iab766011ec9d59190b0855d42a1985963db42eb6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>