Add onTuneFailed when canceling tuning operation

Due to RadioTuner API documentation, onTuneFailed should be called
when a pending tuning operation is canceled. Therefore, a new
result value Canceled was added in broadcast radio HAL. The
onTuneFailed callback for pending tuning operations in default HAL
was implemented by adding whatIfCanceled function field in Task
struct in WorkerThread utils class.

Bug: 257337458
Test: atest RadioTunerTest#cancel_whenTune
Test: atest RadioTunerTest#cancel_whenSeek
Change-Id: I901ab2cc3561082e5f11a9f6c33db044fc9bc28b