AudioPolicyManager: Adjust spatialization track match

Consider Quad as the minimum channel configuration for
reasonable spatialization effect.

Fix bug that only 5.1 AudioTracks could be spatialized.

Test: Spatialization enabled for different channel masks
Test: atest AudioTrackTest#testImmersiveStreaming
Bug: 232154509
Change-Id: I1c57cdf41c4b264c9ee5e5cf717d6e939902203f