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/sthal_cli_2.3 b/soundtrigger/2.3/cli/sthal_cli_2.3
new file mode 100644
index 0000000..78e9f9b
--- /dev/null
+++ b/soundtrigger/2.3/cli/sthal_cli_2.3
@@ -0,0 +1,7 @@
+#!/system/bin/sh
+# Script to start "sthal_cli_2.3" on the device
+#
+base=/system
+export CLASSPATH=$base/framework/sthal_cli_2.3.jar
+exec app_process $base/bin android.hardware.soundtrigger.V2_3.cli.SthalCli "$@"
+