AudioTrack: Clean up ctor initialization

Move key AudioTrack parameters to member variable initialization
to ensure consistent state.

Test: atest CtsMediaAudioTestCases
Test: atest audiotrack_tests
Bug: 333897807
Merged-In: I56dc786c4c291640ad3b0aba600dd5443dca7c6e
Change-Id: I56dc786c4c291640ad3b0aba600dd5443dca7c6e
3 files changed