Implement default radio HAL stopProgramListUpdates

Implemented stopProgramListUpdates method in default AIDL broadcast
radio HAL. Created a separate thread for program list updates, so
that canceling pending tuning operations and canceling pending
program list updates are independent.

Bug: 243681584
Test: atest VtsHalBroadcastradioAidlTargetTest
Change-Id: I9e09f267a2264fa0cbc280d0d6ea71037db519ac
2 files changed