aaudio test: test stealing an exclusive stream

This test starts an exclusive stream.
Then a few seconds later it starts a second exclusive stream.
The first stream should get stolen and they should both end up
as SHARED streams.

See comment at start of test_steal_exclusive.cpp for more information.

Bug: 129846760
Test: this is a test
Test: adb shell test_steal_exclusive
Change-Id: Idff0c394ccee2310dd2d38e7715f823e50955e73