aaudio: Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

BUG: 161896447
Test: all changes are in comments, so just build
Change-Id: I53a4a4c2ade03dcde940e6611f7e6b46d12ffe71

Change-Id: I90ebaea4731c6ca95f312b2176792d50dea862ad
diff --git a/media/libaaudio/examples/utils/unused.cpp b/media/libaaudio/examples/utils/unused.cpp
new file mode 100644
index 0000000..9a5205e
--- /dev/null
+++ b/media/libaaudio/examples/utils/unused.cpp
@@ -0,0 +1,5 @@
+/**
+ * Unused file required to get Android Studio to scan this folder.
+ */
+
+int g_DoNotUseThisVariable = 0;