Create a soundtrigger v2.3 CLI mock

This is ported from the v2.4 CLI in preparation for v2.4's
deprecation.

Bug: 181996624
Test: Manual invocation and verification.
Change-Id: I77c6a12b77b11d74359bcc0792a5a4c70032c7ce
diff --git a/soundtrigger/2.3/cli/OWNERS b/soundtrigger/2.3/cli/OWNERS
new file mode 100644
index 0000000..4fd27f3
--- /dev/null
+++ b/soundtrigger/2.3/cli/OWNERS
@@ -0,0 +1 @@
+include platform/frameworks/base:/services/core/java/com/android/server/soundtrigger_middleware/OWNERS