aaudio: set buffer size to at least one burst

Clip setBufferSizeInFrames() to at least one burst
for Legacy streams to avoid underruns.

Bug: 129545119
Test: Look at BufferSize when you run this.
Test: adb shell write_sine_callback -pn -n0
Test: It should not glitch.
Change-Id: Id82862d59122ba2d9dd98dff579b5c147e40fab5
1 file changed