Move sthal_cli under 2.4

This version is specifically a mock of STHAL 2.4, so it makes more
sense to put it under 2.4 and name it as such.

I intend to add a separate mock for the AIDL version, so making sure
the two don't collide.

Test: Ran the mock HAL and manually verified operation.
Change-Id: Ica8e53b981d73737bfb1720628592e650fc86ee0
diff --git a/soundtrigger/2.4/cli/sthal_cli_2.4 b/soundtrigger/2.4/cli/sthal_cli_2.4
new file mode 100644
index 0000000..0801464
--- /dev/null
+++ b/soundtrigger/2.4/cli/sthal_cli_2.4
@@ -0,0 +1,7 @@
+#!/system/bin/sh
+# Script to start "sthal_cli_2.4" on the device
+#
+base=/system
+export CLASSPATH=$base/framework/sthal_cli_2.4.jar
+exec app_process $base/bin android.hardware.soundtrigger.V2_4.cli.SthalCli "$@"
+