SAP: Ensure pending intent is immutable am: 7b17763dad am: 025e223f5d am: 927b9b73d1 am: bbbd808b95 am: 4bde7ed0b5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Bluetooth/+/12215764

Change-Id: Iacd10846c1fa4bb7afca39e50c137aaa1a61c8e1