aaudio: reduce aaudio.min_sleep_usec default

This can reduce latency for moderate workloads.

Bug: 220364385
Test: synthmark -tl -n1 -N75 -a2
Test: atest CtsNativeMediaAAudioTestCases
Change-Id: Iff76a0a6175e7b048b65eee19f2cb2677d035e0e
1 file changed