aaudio: update stream performance mode after open

For example, if you cannot get a FAST track then
the performanceMode of the stream will be AAUDIO_PERFORMANCE_MODE_NONE
instead of AAUDIO_PERFORMANCE_MODE_LOW_LATENCY

Bug: 38268707
Test: write_sine_callback.cpp, change modes and sample rates
Change-Id: I33648bd48fd00d588424fa7e4deb2c57c5008423
Signed-off-by: Phil Burk <philburk@google.com>
2 files changed