Merge "SAP: Mark the PendingIntents with FLAG_IMMUTABLE" am: 996801cfec

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Bluetooth/+/1566073

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I834fa3d4871e83df401bed025f22ddd43a3fb1e6