SoundPool: never-delete singleton to avoid exit race

Test: atest SoundPoolOggTest SoundPoolAacTest SoundPoolMidiTest SoundPoolHapticTest
Bug: 316799609
Merged-In: I5b278960207d1b2c9fa80bbc57b2e15dd4498f13
Change-Id: I5b278960207d1b2c9fa80bbc57b2e15dd4498f13
1 file changed