AAudio: log result of openStream

Log the MMAP/Legacy path, device ID, perf mode and burst size.
when a stream is opened.

This will help debug CTS Verifier failures.

Add utility to convert perfMode to short name.
Also cleaned up some indentation in AudioGlobal.cpp
to keep the Linter happy.

Bug: 354875536
Test: adb logcat *:S AAudio:D
Test: Run OboeTester, TEST OUTPUT
Test: Open various types of stream and check the log.
Flag: EXEMPT bugfix
Change-Id: I094a6f817aee94434d1dd113a4b74790da039726