Fix tuning race condition in broadcast radio VTS

Reset tuner callback in broadcast radio VTS DAB/HD tuning test to
address race condition between tuning operation and the program
info updates before the operation.

Bug: 384062869
Flag: EXEMPT bugfix
Test: atest VtsHalBroadcastradioAidlTargetTest
Merged-In: Ib53c8be9b6b6eca5a2b947e109f3cc0a26ea9ae2
Change-Id: Ib53c8be9b6b6eca5a2b947e109f3cc0a26ea9ae2